#include <elastic_cable_rayleigh_damping.h>

Inheritance diagram for GRINS::ElasticCableRayleighDamping< StressStrainLaw >:

Collaboration diagram for GRINS::ElasticCableRayleighDamping< StressStrainLaw >:

Public Member Functions
	ElasticCableRayleighDamping (const PhysicsName &physics_name, const GetPot &input, bool is_compressible)

virtual	~ElasticCableRayleighDamping ()

virtual void	damping_residual (bool compute_jacobian, AssemblyContext &context)
	Time dependent part(s) of physics for element interiors. More...

Public Member Functions inherited from GRINS::ElasticCableBase< StressStrainLaw >
	ElasticCableBase (const GRINS::PhysicsName &physics_name, const GetPot &input, bool is_compressible)

virtual	~ElasticCableBase ()

Public Member Functions inherited from GRINS::ElasticCableAbstract
	ElasticCableAbstract (const GRINS::PhysicsName &physics_name, const GetPot &input)

virtual	~ElasticCableAbstract ()

virtual void	init_context (AssemblyContext &context)
	Initialize context for added physics variables. More...

Public Member Functions inherited from GRINS::SolidMechanicsAbstract
	SolidMechanicsAbstract (const GRINS::PhysicsName &physics_name, const GetPot &input)

virtual	~SolidMechanicsAbstract ()

virtual void	set_time_evolving_vars (libMesh::FEMSystem *system)
	Set which variables are time evolving. More...

Public Member Functions inherited from GRINS::Physics
	Physics (const GRINS::PhysicsName &physics_name, const GetPot &input)

virtual	~Physics ()

virtual void	init_variables (libMesh::FEMSystem *)
	Initialize variables for this physics. More...

virtual bool	enabled_on_elem (const libMesh::Elem *elem)
	Find if current physics is active on supplied element. More...

void	set_is_steady (bool is_steady)
	Sets whether this physics is to be solved with a steady solver or not. More...

bool	is_steady () const
	Returns whether or not this physics is being solved with a steady solver. More...

virtual void	auxiliary_init (MultiphysicsSystem &system)
	Any auxillary initialization a Physics class may need. More...

virtual void	register_postprocessing_vars (const GetPot &input, PostProcessedQuantities< libMesh::Real > &postprocessing)
	Register name of postprocessed quantity with PostProcessedQuantities. More...

virtual void	preassembly (MultiphysicsSystem &)
	Perform any necessary setup before element assembly begins. More...

virtual void	reinit (MultiphysicsSystem &)
	Any reinitialization that needs to be done. More...

virtual void	element_time_derivative (bool, AssemblyContext &)
	Time dependent part(s) of physics for element interiors. More...

virtual void	side_time_derivative (bool, AssemblyContext &)
	Time dependent part(s) of physics for boundaries of elements on the domain boundary. More...

virtual void	nonlocal_time_derivative (bool, AssemblyContext &)
	Time dependent part(s) of physics for scalar variables. More...

virtual void	element_constraint (bool, AssemblyContext &)
	Constraint part(s) of physics for element interiors. More...

virtual void	side_constraint (bool, AssemblyContext &)
	Constraint part(s) of physics for boundaries of elements on the domain boundary. More...

virtual void	nonlocal_constraint (bool, AssemblyContext &)
	Constraint part(s) of physics for scalar variables. More...

virtual void	mass_residual (bool, AssemblyContext &)
	Mass matrix part(s) for element interiors. All boundary terms lie within the time_derivative part. More...

virtual void	nonlocal_mass_residual (bool, AssemblyContext &)
	Mass matrix part(s) for scalar variables. More...

void	init_ics (libMesh::FEMSystem *system, libMesh::CompositeFunction< libMesh::Number > &all_ics)

virtual void	compute_element_time_derivative_cache (AssemblyContext &)

virtual void	compute_side_time_derivative_cache (AssemblyContext &)

virtual void	compute_nonlocal_time_derivative_cache (AssemblyContext &)

virtual void	compute_element_constraint_cache (AssemblyContext &)

virtual void	compute_side_constraint_cache (AssemblyContext &)

virtual void	compute_nonlocal_constraint_cache (AssemblyContext &)

virtual void	compute_damping_residual_cache (AssemblyContext &)

virtual void	compute_mass_residual_cache (AssemblyContext &)

virtual void	compute_nonlocal_mass_residual_cache (AssemblyContext &)

virtual void	compute_postprocessed_quantity (unsigned int quantity_index, const AssemblyContext &context, const libMesh::Point &point, libMesh::Real &value)

ICHandlingBase *	get_ic_handler ()

Public Member Functions inherited from GRINS::ParameterUser
	ParameterUser (const std::string &user_name)

virtual	~ParameterUser ()

virtual void	set_parameter (libMesh::Number &param_variable, const GetPot &input, const std::string &param_name, libMesh::Number param_default)
	Each subclass can simultaneously read a parameter value from. More...

virtual void	set_parameter (libMesh::ParsedFunction< libMesh::Number, libMesh::Gradient > &func, const GetPot &input, const std::string &func_param_name, const std::string &param_default)
	Each subclass can simultaneously read a parsed function from. More...

virtual void	set_parameter (libMesh::ParsedFEMFunction< libMesh::Number > &func, const GetPot &input, const std::string &func_param_name, const std::string &param_default)
	Each subclass can simultaneously read a parsed function from. More...

virtual void	move_parameter (const libMesh::Number &old_parameter, libMesh::Number &new_parameter)
	When cloning an object, we need to update parameter pointers. More...

virtual void	move_parameter (const libMesh::ParsedFunction< libMesh::Number, libMesh::Gradient > &old_func, libMesh::ParsedFunction< libMesh::Number, libMesh::Gradient > &new_func)
	When cloning an object, we need to update parameter pointers. More...

virtual void	move_parameter (const libMesh::ParsedFEMFunction< libMesh::Number > &old_func, libMesh::ParsedFEMFunction< libMesh::Number > &new_func)
	When cloning an object, we need to update parameter pointers. More...

virtual void	register_parameter (const std::string &param_name, libMesh::ParameterMultiAccessor< libMesh::Number > &param_pointer) const
	Each subclass will register its copy of an independent. More...

Protected Attributes
libMesh::Real	_lambda_factor

libMesh::Real	_mu_factor

Protected Attributes inherited from GRINS::ElasticCableBase< StressStrainLaw >
StressStrainLaw	_stress_strain_law

bool	_is_compressible

Protected Attributes inherited from GRINS::ElasticCableAbstract
libMesh::Real	_A
	Cross-sectional area of the cable. More...

libMesh::Real	_rho
	Cable density. More...

Protected Attributes inherited from GRINS::SolidMechanicsAbstract
DisplacementVariable &	_disp_vars

Protected Attributes inherited from GRINS::Physics
const PhysicsName	_physics_name
	Name of the physics object. Used for reading physics specific inputs. More...

GRINS::ICHandlingBase *	_ic_handler

std::set< libMesh::subdomain_id_type >	_enabled_subdomains
	Subdomains on which the current Physics class is enabled. More...

Private Member Functions
	ElasticCableRayleighDamping ()

Additional Inherited Members
Static Public Member Functions inherited from GRINS::Physics
static void	set_is_axisymmetric (bool is_axisymmetric)
	Set whether we should treat the problem as axisymmetric. More...

static bool	is_axisymmetric ()

Static Public Attributes inherited from GRINS::ParameterUser
static std::string	zero_vector_function = std::string("{0}")
	A parseable function string with LIBMESH_DIM components, all 0. More...

Protected Types inherited from GRINS::SolidMechanicsAbstract
typedef const libMesh::DenseSubVector< libMesh::Number > &(libMesh::DiffContext::*	VarFuncType) (unsigned int) const

typedef void(libMesh::FEMContext::*	InteriorFuncType) (unsigned int, unsigned int, libMesh::Real &) const

typedef libMesh::Real(libMesh::DiffContext::*	VarDerivType) () const

Protected Member Functions inherited from GRINS::ElasticCableBase< StressStrainLaw >
void	mass_residual_impl (bool compute_jacobian, AssemblyContext &context, InteriorFuncType interior_solution, VarDerivType get_solution_deriv, libMesh::Real mu=1.0)
	Implementation of mass_residual. More...

void	compute_metric_tensors (unsigned int qp, const libMesh::FEBase &elem, const AssemblyContext &context, const libMesh::Gradient &grad_u, const libMesh::Gradient &grad_v, const libMesh::Gradient &grad_w, libMesh::TensorValue< libMesh::Real > &a_cov, libMesh::TensorValue< libMesh::Real > &a_contra, libMesh::TensorValue< libMesh::Real > &A_cov, libMesh::TensorValue< libMesh::Real > &A_contra, libMesh::Real &lambda_sq)

Protected Member Functions inherited from GRINS::ElasticCableAbstract
const libMesh::FEGenericBase< libMesh::Real > *	get_fe (const AssemblyContext &context)

Protected Member Functions inherited from GRINS::Physics
libMesh::UniquePtr< libMesh::FEGenericBase< libMesh::Real > >	build_new_fe (const libMesh::Elem elem, const libMesh::FEGenericBase< libMesh::Real > fe, const libMesh::Point p)

void	parse_enabled_subdomains (const GetPot &input, const std::string &physics_name)

void	check_var_subdomain_consistency (const FEVariablesBase &var) const
	Check that var is enabled on at least the subdomains this Physics is. More...

Static Protected Attributes inherited from GRINS::Physics
static bool	_is_steady = false
	Caches whether or not the solver that's being used is steady or not. More...

static bool	_is_axisymmetric = false
	Caches whether we are solving an axisymmetric problem or not. More...

Detailed Description

template<typename StressStrainLaw>
class GRINS::ElasticCableRayleighDamping< StressStrainLaw >

Definition at line 33 of file elastic_cable_rayleigh_damping.h.

Constructor & Destructor Documentation

template<typename StressStrainLaw >

GRINS::ElasticCableRayleighDamping< StressStrainLaw >::ElasticCableRayleighDamping	(	const PhysicsName &	physics_name,
		const GetPot &	input,
		bool	is_compressible
	)

Definition at line 39 of file elastic_cable_rayleigh_damping.C.

References GRINS::PhysicsNaming::elastic_cable(), GRINS::PhysicsNaming::elastic_cable_rayleigh_damping(), and GRINS::Physics::parse_enabled_subdomains().

     : ElasticCableBase<StressStrainLaw>(physics_name,input,is_compressible),
     _lambda_factor(input("Physics/"+PhysicsNaming::elastic_cable_rayleigh_damping()+"/lambda_factor",0.0)),
     _mu_factor(input("Physics/"+PhysicsNaming::elastic_cable_rayleigh_damping()+"/mu_factor",0.0))
   {
     if( !input.have_variable("Physics/"+PhysicsNaming::elastic_cable_rayleigh_damping()+"/lambda_factor") )
       libmesh_error_msg("ERROR: Couldn't find Physics/"+PhysicsNaming::elastic_cable_rayleigh_damping()+"/lambda_factor in input!");
 
     if( !input.have_variable("Physics/"+PhysicsNaming::elastic_cable_rayleigh_damping()+"/mu_factor") )
       libmesh_error_msg("ERROR: Couldn't find Physics/"+PhysicsNaming::elastic_cable_rayleigh_damping()+"/mu_factor in input!");
 
 
     // If the user specified enabled subdomains in this Physics section,
     // that's an error; we're slave to ElasticCable.
     if( input.have_variable("Physics/"+PhysicsNaming::elastic_cable_rayleigh_damping()+"/enabled_subdomains" ) )
       libmesh_error_msg("ERROR: Cannot specify subdomains for "
                         +PhysicsNaming::elastic_cable_rayleigh_damping()
                         +"! Must specify subdomains through "
                         +PhysicsNaming::elastic_cable()+".");
 
     this->parse_enabled_subdomains(input,PhysicsNaming::elastic_cable());
   }

template<typename StressStrainLaw >

virtual GRINS::ElasticCableRayleighDamping< StressStrainLaw >::~ElasticCableRayleighDamping ( )

inlinevirtual

Definition at line 41 of file elastic_cable_rayleigh_damping.h.

41 {};

template<typename StressStrainLaw >

GRINS::ElasticCableRayleighDamping< StressStrainLaw >::ElasticCableRayleighDamping ( )

private

Member Function Documentation

template<typename StressStrainLaw >

void GRINS::ElasticCableRayleighDamping< StressStrainLaw >::damping_residual	(	bool	compute_jacobian,
		AssemblyContext &	context
	)

virtual

Time dependent part(s) of physics for element interiors.

Reimplemented from GRINS::Physics.

Definition at line 66 of file elastic_cable_rayleigh_damping.C.

   {
     // First, do the "mass" contribution
     this->mass_residual_impl(compute_jacobian,
                              context,
                              &libMesh::FEMContext::interior_rate,
                              &libMesh::DiffContext::get_elem_solution_rate_derivative,
                              _mu_factor);
 
     // Now do the stiffness contribution
     const unsigned int n_u_dofs = context.get_dof_indices(this->_disp_vars.u()).size();
 
     const std::vector<libMesh::Real> &JxW =
       this->get_fe(context)->get_JxW();
 
     // Residuals, Jacobians that we're populating
     libMesh::DenseSubVector<libMesh::Number> &Fu = context.get_elem_residual(this->_disp_vars.u());
     libMesh::DenseSubVector<libMesh::Number>* Fv = NULL;
     libMesh::DenseSubVector<libMesh::Number>* Fw = NULL;
 
     libMesh::DenseSubMatrix<libMesh::Number>& Kuu = context.get_elem_jacobian(this->_disp_vars.u(),this->_disp_vars.u());
     libMesh::DenseSubMatrix<libMesh::Number>* Kuv = NULL;
     libMesh::DenseSubMatrix<libMesh::Number>* Kuw = NULL;
 
     libMesh::DenseSubMatrix<libMesh::Number>* Kvu = NULL;
     libMesh::DenseSubMatrix<libMesh::Number>* Kvv = NULL;
     libMesh::DenseSubMatrix<libMesh::Number>* Kvw = NULL;
 
     libMesh::DenseSubMatrix<libMesh::Number>* Kwu = NULL;
     libMesh::DenseSubMatrix<libMesh::Number>* Kwv = NULL;
     libMesh::DenseSubMatrix<libMesh::Number>* Kww = NULL;
 
     if( this->_disp_vars.dim() >= 2 )
       {
         Fv = &context.get_elem_residual(this->_disp_vars.v());
 
         Kuv = &context.get_elem_jacobian(this->_disp_vars.u(),this->_disp_vars.v());
         Kvu = &context.get_elem_jacobian(this->_disp_vars.v(),this->_disp_vars.u());
         Kvv = &context.get_elem_jacobian(this->_disp_vars.v(),this->_disp_vars.v());
       }
 
     if( this->_disp_vars.dim() == 3 )
       {
         Fw = &context.get_elem_residual(this->_disp_vars.w());
 
         Kuw = &context.get_elem_jacobian(this->_disp_vars.u(),this->_disp_vars.w());
         Kvw = &context.get_elem_jacobian(this->_disp_vars.v(),this->_disp_vars.w());
         Kwu = &context.get_elem_jacobian(this->_disp_vars.w(),this->_disp_vars.u());
         Kwv = &context.get_elem_jacobian(this->_disp_vars.w(),this->_disp_vars.v());
         Kww = &context.get_elem_jacobian(this->_disp_vars.w(),this->_disp_vars.w());
       }
 
     unsigned int n_qpoints = context.get_element_qrule().n_points();
 
     // All shape function gradients are w.r.t. master element coordinates
     const std::vector<std::vector<libMesh::Real> >& dphi_dxi = this->get_fe(context)->get_dphidxi();
 
     const libMesh::DenseSubVector<libMesh::Number>& u_coeffs = context.get_elem_solution( this->_disp_vars.u() );
     const libMesh::DenseSubVector<libMesh::Number>* v_coeffs = NULL;
     const libMesh::DenseSubVector<libMesh::Number>* w_coeffs = NULL;
 
     if( this->_disp_vars.dim() >= 2 )
       v_coeffs = &context.get_elem_solution( this->_disp_vars.v() );
 
     if( this->_disp_vars.dim() == 3 )
       w_coeffs = &context.get_elem_solution( this->_disp_vars.w() );
 
     const libMesh::DenseSubVector<libMesh::Number>& dudt_coeffs =
       context.get_elem_solution_rate( this->_disp_vars.u() );
     const libMesh::DenseSubVector<libMesh::Number>* dvdt_coeffs = NULL;
     const libMesh::DenseSubVector<libMesh::Number>* dwdt_coeffs = NULL;
 
     if( this->_disp_vars.dim() >= 2 )
       dvdt_coeffs = &context.get_elem_solution_rate( this->_disp_vars.v() );
 
     if( this->_disp_vars.dim() == 3 )
       dwdt_coeffs = &context.get_elem_solution_rate( this->_disp_vars.w() );
 
     // Need these to build up the covariant and contravariant metric tensors
     const std::vector<libMesh::RealGradient>& dxdxi  = this->get_fe(context)->get_dxyzdxi();
 
     const unsigned int dim = 1; // The cable dimension is always 1 for this physics
 
     for (unsigned int qp=0; qp != n_qpoints; qp++)
       {
         // Gradients are w.r.t. master element coordinates
         libMesh::Gradient grad_u, grad_v, grad_w;
         libMesh::Gradient dgradu_dt, dgradv_dt, dgradw_dt;
 
         for( unsigned int d = 0; d < n_u_dofs; d++ )
           {
             libMesh::RealGradient u_gradphi( dphi_dxi[d][qp] );
             grad_u += u_coeffs(d)*u_gradphi;
             dgradu_dt += dudt_coeffs(d)*u_gradphi;
 
             if( this->_disp_vars.dim() >= 2 )
               {
                 grad_v += (*v_coeffs)(d)*u_gradphi;
                 dgradv_dt += (*dvdt_coeffs)(d)*u_gradphi;
               }
 
             if( this->_disp_vars.dim() == 3 )
               {
                 grad_w += (*w_coeffs)(d)*u_gradphi;
                 dgradw_dt += (*dwdt_coeffs)(d)*u_gradphi;
               }
           }
 
         libMesh::RealGradient grad_x( dxdxi[qp](0) );
         libMesh::RealGradient grad_y( dxdxi[qp](1) );
         libMesh::RealGradient grad_z( dxdxi[qp](2) );
 
         libMesh::TensorValue<libMesh::Real> a_cov, a_contra, A_cov, A_contra;
         libMesh::Real lambda_sq = 0;
 
         this->compute_metric_tensors( qp, *(this->get_fe(context)), context,
                                       grad_u, grad_v, grad_w,
                                       a_cov, a_contra, A_cov, A_contra,
                                       lambda_sq );
 
         // Compute stress tensor
         libMesh::TensorValue<libMesh::Real> tau;
         ElasticityTensor C;
         this->_stress_strain_law.compute_stress_and_elasticity(dim,a_contra,a_cov,A_contra,A_cov,tau,C);
 
         libMesh::Real jac = JxW[qp];
 
         for (unsigned int i=0; i != n_u_dofs; i++)
           {
             libMesh::RealGradient u_gradphi( dphi_dxi[i][qp] );
 
             libMesh::Real u_diag_factor = _lambda_factor*this->_A*jac*tau(0,0)*dgradu_dt(0)*u_gradphi(0);
             libMesh::Real v_diag_factor = _lambda_factor*this->_A*jac*tau(0,0)*dgradv_dt(0)*u_gradphi(0);
             libMesh::Real w_diag_factor = _lambda_factor*this->_A*jac*tau(0,0)*dgradw_dt(0)*u_gradphi(0);
 
             const libMesh::Real C1 = _lambda_factor*this->_A*jac*C(0,0,0,0)*u_gradphi(0);
 
             const libMesh::Real gamma_u = (grad_x(0)+grad_u(0));
 
             libMesh::Real gamma_v = 0.0;
             libMesh::Real gamma_w = 0.0;
 
             if( this->_disp_vars.dim() >= 2 )
               gamma_v = (grad_y(0)+grad_v(0));
 
             if( this->_disp_vars.dim() == 3 )
               gamma_w = (grad_z(0)+grad_w(0));
 
             const libMesh::Real x_term = C1*gamma_u;
             const libMesh::Real y_term = C1*gamma_v;
             const libMesh::Real z_term = C1*gamma_w;
 
             libMesh::Real dt_term = dgradu_dt(0)*gamma_u + dgradv_dt(0)*gamma_v + dgradw_dt(0)*gamma_w;
 
             Fu(i) += u_diag_factor + x_term*dt_term;
 
             if( this->_disp_vars.dim() >= 2 )
               (*Fv)(i) += v_diag_factor + y_term*dt_term;
 
             if( this->_disp_vars.dim() == 3 )
               (*Fw)(i) += w_diag_factor + z_term*dt_term;
           }
 
         if( compute_jacobian )
           {
             for(unsigned int i=0; i != n_u_dofs; i++)
               {
                 libMesh::RealGradient u_gradphi_I( dphi_dxi[i][qp] );
 
                 for(unsigned int j=0; j != n_u_dofs; j++)
                   {
                     libMesh::RealGradient u_gradphi_J( dphi_dxi[j][qp] );
 
                     libMesh::Real common_factor = _lambda_factor*this->_A*jac*u_gradphi_I(0);
 
                     const libMesh::Real diag_term_1 = common_factor*tau(0,0)*u_gradphi_J(0)*context.get_elem_solution_rate_derivative();
 
                     const libMesh::Real dgamma_du = ( u_gradphi_J(0)*(grad_x(0)+grad_u(0)) );
 
                     const libMesh::Real dgamma_dv = ( u_gradphi_J(0)*(grad_y(0)+grad_v(0)) );
 
                     const libMesh::Real dgamma_dw = ( u_gradphi_J(0)*(grad_z(0)+grad_w(0)) );
 
                     const libMesh::Real diag_term_2_factor = common_factor*C(0,0,0,0)*context.get_elem_solution_derivative();
 
                     Kuu(i,j) += diag_term_1 + dgradu_dt(0)*diag_term_2_factor*dgamma_du;
 
                     if( this->_disp_vars.dim() >= 2 )
                       {
                         (*Kuv)(i,j) += dgradu_dt(0)*diag_term_2_factor*dgamma_dv;
                         (*Kvu)(i,j) += dgradv_dt(0)*diag_term_2_factor*dgamma_du;
                         (*Kvv)(i,j) += diag_term_1 + dgradv_dt(0)*diag_term_2_factor*dgamma_dv;
                       }
 
                     if( this->_disp_vars.dim() == 3 )
                       {
                         (*Kuw)(i,j) += dgradu_dt(0)*diag_term_2_factor*dgamma_dw;
                         (*Kvw)(i,j) += dgradv_dt(0)*diag_term_2_factor*dgamma_dw;
                         (*Kwu)(i,j) += dgradw_dt(0)*diag_term_2_factor*dgamma_du;
                         (*Kwv)(i,j) += dgradw_dt(0)*diag_term_2_factor*dgamma_dv;
                         (*Kww)(i,j) += diag_term_1 + dgradw_dt(0)*diag_term_2_factor*dgamma_dw;
                       }
 
                     const libMesh::Real C1 = common_factor*C(0,0,0,0);
 
                     const libMesh::Real gamma_u = (grad_x(0)+grad_u(0));
                     const libMesh::Real gamma_v = (grad_y(0)+grad_v(0));
                     const libMesh::Real gamma_w = (grad_z(0)+grad_w(0));
 
                     const libMesh::Real x_term = C1*gamma_u;
                     const libMesh::Real y_term = C1*gamma_v;
                     const libMesh::Real z_term = C1*gamma_w;
 
                     const libMesh::Real ddtterm_du = u_gradphi_J(0)*(gamma_u*context.get_elem_solution_rate_derivative()
                                                                      + dgradu_dt(0)*context.get_elem_solution_derivative());
 
                     libMesh::Real ddtterm_dv = 0.0;
                     if( this->_disp_vars.dim() >= 2 )
                       ddtterm_dv = u_gradphi_J(0)*(gamma_v*context.get_elem_solution_rate_derivative()
                                                    + dgradv_dt(0)*context.get_elem_solution_derivative());
 
                     libMesh::Real ddtterm_dw = 0.0;
                     if( this->_disp_vars.dim() == 3 )
                       ddtterm_dw = u_gradphi_J(0)*(gamma_w*context.get_elem_solution_rate_derivative()
                                                    + dgradw_dt(0)*context.get_elem_solution_derivative());
 
                     Kuu(i,j) += x_term*ddtterm_du;
 
                     if( this->_disp_vars.dim() >= 2 )
                       {
                         (*Kuv)(i,j) += x_term*ddtterm_dv;
                         (*Kvu)(i,j) += y_term*ddtterm_du;
                         (*Kvv)(i,j) += y_term*ddtterm_dv;
                       }
 
                     if( this->_disp_vars.dim() == 3 )
                       {
                         (*Kuw)(i,j) += x_term*ddtterm_dw;
                         (*Kvw)(i,j) += y_term*ddtterm_dw;
                         (*Kwu)(i,j) += z_term*ddtterm_du;
                         (*Kwv)(i,j) += z_term*ddtterm_dv;
                         (*Kww)(i,j) += z_term*ddtterm_dw;
                       }
 
                     libMesh::Real dt_term = dgradu_dt(0)*gamma_u + dgradv_dt(0)*gamma_v + dgradw_dt(0)*gamma_w;
 
                     // Here, we're missing derivatives of C(0,0,0,0) w.r.t. strain
                     // Nonzero for hyperelasticity models
                     const libMesh::Real dxterm_du = C1*u_gradphi_J(0)*context.get_elem_solution_derivative();
                     const libMesh::Real dyterm_dv = dxterm_du;
                     const libMesh::Real dzterm_dw = dxterm_du;
 
                     Kuu(i,j) += dxterm_du*dt_term;
 
                     if( this->_disp_vars.dim() >= 2 )
                       (*Kvv)(i,j) += dyterm_dv*dt_term;
 
                     if( this->_disp_vars.dim() == 3 )
                       (*Kww)(i,j) += dzterm_dw*dt_term;
 
                   } // end j-loop
               } // end i-loop
           } // end if(compute_jacobian)
       } // end qp loop
   }