GRINS::AveragedFanBase< Viscosity > Class Template Reference

#include <averaged_fan_base.h>

Inheritance diagram for GRINS::AveragedFanBase< Viscosity >:

Collaboration diagram for GRINS::AveragedFanBase< Viscosity >:

Public Member Functions
	AveragedFanBase (const std::string &physics_name, const GetPot &input)
	~AveragedFanBase ()
bool	compute_force (const libMesh::Point &point, const libMesh::Real time, const libMesh::NumberVectorValue &U, libMesh::NumberVectorValue &F, libMesh::NumberTensorValue *dFdU=NULL)
Public Member Functions inherited from GRINS::IncompressibleNavierStokesBase< Viscosity >
	IncompressibleNavierStokesBase (const std::string &my_physics_name, const std::string &core_physics_name, const GetPot &input)
	~IncompressibleNavierStokesBase ()
virtual void	init_variables (libMesh::FEMSystem *system)
	Initialization of Navier-Stokes variables. More...
virtual void	set_time_evolving_vars (libMesh::FEMSystem *system)
	Sets velocity variables to be time-evolving. More...
virtual void	init_context (AssemblyContext &context)
	Initialize context for added physics variables. 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...
libMesh::Real	get_viscosity_value (AssemblyContext &context, unsigned int qp) const
Public Member Functions inherited from GRINS::Physics
	Physics (const GRINS::PhysicsName &physics_name, const GetPot &input)
virtual	~Physics ()
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	element_time_derivative (bool compute_jacobian, AssemblyContext &context, CachedValues &cache)
	Time dependent part(s) of physics for element interiors. More...
virtual void	side_time_derivative (bool compute_jacobian, AssemblyContext &context, CachedValues &cache)
	Time dependent part(s) of physics for boundaries of elements on the domain boundary. More...
virtual void	nonlocal_time_derivative (bool compute_jacobian, AssemblyContext &context, CachedValues &cache)
	Time dependent part(s) of physics for scalar variables. More...
virtual void	element_constraint (bool compute_jacobian, AssemblyContext &context, CachedValues &cache)
	Constraint part(s) of physics for element interiors. More...
virtual void	side_constraint (bool compute_jacobian, AssemblyContext &context, CachedValues &cache)
	Constraint part(s) of physics for boundaries of elements on the domain boundary. More...
virtual void	nonlocal_constraint (bool compute_jacobian, AssemblyContext &context, CachedValues &cache)
	Constraint part(s) of physics for scalar variables. More...
virtual void	damping_residual (bool compute_jacobian, AssemblyContext &context, CachedValues &cache)
	Damping matrix part(s) for element interiors. All boundary terms lie within the time_derivative part. More...
virtual void	mass_residual (bool compute_jacobian, AssemblyContext &context, CachedValues &cache)
	Mass matrix part(s) for element interiors. All boundary terms lie within the time_derivative part. More...
virtual void	nonlocal_mass_residual (bool compute_jacobian, AssemblyContext &context, CachedValues &cache)
	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 (const AssemblyContext &context, CachedValues &cache)
virtual void	compute_side_time_derivative_cache (const AssemblyContext &context, CachedValues &cache)
virtual void	compute_nonlocal_time_derivative_cache (const AssemblyContext &context, CachedValues &cache)
virtual void	compute_element_constraint_cache (const AssemblyContext &context, CachedValues &cache)
virtual void	compute_side_constraint_cache (const AssemblyContext &context, CachedValues &cache)
virtual void	compute_nonlocal_constraint_cache (const AssemblyContext &context, CachedValues &cache)
virtual void	compute_damping_residual_cache (const AssemblyContext &context, CachedValues &cache)
virtual void	compute_mass_residual_cache (const AssemblyContext &context, CachedValues &cache)
virtual void	compute_nonlocal_mass_residual_cache (const AssemblyContext &context, CachedValues &cache)
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...

Protected Attributes
libMesh::ParsedFunction< libMesh::Number >	base_velocity_function
libMesh::ParsedFunction< libMesh::Number >	local_vertical_function
libMesh::ParsedFunction< libMesh::Number >	lift_function
libMesh::ParsedFunction< libMesh::Number >	drag_function
libMesh::ParsedFunction< libMesh::Number >	chord_function
libMesh::ParsedFunction< libMesh::Number >	area_swept_function
libMesh::ParsedFunction< libMesh::Number >	aoa_function
Protected Attributes inherited from GRINS::IncompressibleNavierStokesBase< Viscosity >
unsigned int	_dim
	Physical dimension of problem. More...
VelocityFEVariables	_flow_vars
PressureFEVariable	_press_var
libMesh::Number	_rho
	Material parameters, read from input. More...
Viscosity	_mu
	Viscosity object. More...
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
void	read_input_options (const GetPot &input)
	Read options from GetPot input file. More...
	AveragedFanBase ()

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 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)
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<class Viscosity>
class GRINS::AveragedFanBase< Viscosity >

Definition at line 45 of file averaged_fan_base.h.

Constructor & Destructor Documentation

template<class Mu >

GRINS::AveragedFanBase< Mu >::AveragedFanBase	(	const std::string &	physics_name,
		const GetPot &	input
	)

Definition at line 38 of file averaged_fan_base.C.

References GRINS::AveragedFanBase< Viscosity >::read_input_options().

    : IncompressibleNavierStokesBase<Mu>(physics_name,
                                         PhysicsNaming::incompressible_navier_stokes(), /* "core" Physics name */
                                         input),
      base_velocity_function(""),
      local_vertical_function(""),
      lift_function(""),
      drag_function(""),
      chord_function(""),
      area_swept_function(""),
      aoa_function("")
  {
    this->read_input_options(input);
  }

template<class Viscosity >

GRINS::AveragedFanBase< Viscosity >::~AveragedFanBase ( )

inline

Definition at line 51 of file averaged_fan_base.h.

{};

template<class Viscosity >

GRINS::AveragedFanBase< Viscosity >::AveragedFanBase ( )

private

Member Function Documentation

template<class Mu >

bool GRINS::AveragedFanBase< Mu >::compute_force	(	const libMesh::Point &	point,
		const libMesh::Real	time,
		const libMesh::NumberVectorValue &	U,
		libMesh::NumberVectorValue &	F,
		libMesh::NumberTensorValue *	dFdU = NULL
	)

Definition at line 113 of file averaged_fan_base.C.

  {
    // Find base velocity of moving fan at this point
    libMesh::DenseVector<libMesh::Number> output_vec(3);

    base_velocity_function(point, time,
                           output_vec);

    const libMesh::NumberVectorValue U_B(output_vec(0),
                                         output_vec(1),
                                         output_vec(2));

    const libMesh::Number U_B_size = U_B.size();

    // If there's no base velocity there's no fan
    if (!U_B_size)
      return false;

    // Normal in fan velocity direction
    const libMesh::NumberVectorValue N_B =
      libMesh::NumberVectorValue(U_B/U_B_size);

    local_vertical_function(point, time,
                            output_vec);

    // Normal in fan vertical direction
    const libMesh::NumberVectorValue N_V(output_vec(0),
                                         output_vec(1),
                                         output_vec(2));

    // Normal in radial direction (or opposite radial direction,
    // for fans turning clockwise!)
    const libMesh::NumberVectorValue N_R = N_B.cross(N_V);

    // Fan-wing-plane component of local relative velocity
    const libMesh::NumberVectorValue U_P = U - (U*N_R)*N_R - U_B;

    const libMesh::Number U_P_size = U_P.size();

    // If there's no flow in the fan's frame of reference, there's no
    // lift or drag.  FIXME - should we account for drag in the
    // out-of-plane direction?
    if (!U_P_size)
      return false;

    // Direction opposing drag
    const libMesh::NumberVectorValue N_drag =
      libMesh::NumberVectorValue(-U_P/U_P_size);

    // Direction opposing lift
    const libMesh::NumberVectorValue N_lift = N_drag.cross(N_R);

    // "Forward" velocity
    const libMesh::Number u_fwd = -(U_P * N_B);

    // "Upward" velocity
    const libMesh::Number u_up = U_P * N_V;

    // If there's no forward or upward velocity we should have already
    // returned false
    libmesh_assert (u_up || u_fwd);

    // Angle WRT fan velocity direction
    const libMesh::Number part_angle = std::atan2(u_up, u_fwd);

    // Angle WRT fan chord
    const libMesh::Number angle = part_angle +
      aoa_function(point, time);

    const libMesh::Number C_lift  = lift_function(point, angle);
    const libMesh::Number C_drag  = drag_function(point, angle);

    const libMesh::Number chord = chord_function(point, time);
    const libMesh::Number area  = area_swept_function(point, time);

    const libMesh::Number v_sq = U_P*U_P;

    const libMesh::Number LDfactor = 0.5 * this->_rho * v_sq * chord / area;
    const libMesh::Number lift = C_lift * LDfactor;
    const libMesh::Number drag = C_drag * LDfactor;

    // Force
    F = lift * N_lift + drag * N_drag;

    if (dFdU)
      {
        // FIXME: Jacobians here are very inexact!
        // Dropping all AoA dependence on U terms!
        const libMesh::NumberVectorValue LDderivfactor =
          (N_lift*C_lift+N_drag*C_drag) *
          this->_rho * chord / area;

        for (unsigned int i=0; i != 3; ++i)
          for (unsigned int j=0; j != 3; ++j)
            (*dFdU)(i,j) = LDderivfactor(i) * U_P(j);
      }

    return true;
  }

template<class Mu >

void GRINS::AveragedFanBase< Mu >::read_input_options ( const GetPot &  input )

private

Read options from GetPot input file.

Definition at line 54 of file averaged_fan_base.C.

References GRINS::PhysicsNaming::averaged_fan().

Referenced by GRINS::AveragedFanBase< Viscosity >::AveragedFanBase().

  {
    this->set_parameter(base_velocity_function, input,
                        "Physics/"+PhysicsNaming::averaged_fan()+"/base_velocity",
                        this->zero_vector_function);

    if (base_velocity_function.expression() == this->zero_vector_function)
      libmesh_error_msg("Error! Zero AveragedFan specified!" <<
                        std::endl);

    this->set_parameter(local_vertical_function, input,
                        "Physics/"+PhysicsNaming::averaged_fan()+"/local_vertical",
                        this->zero_vector_function);

    if (local_vertical_function.expression() == this->zero_vector_function)
      libmesh_error_msg("Error! Zero LocalVertical specified!" <<
                        std::endl);

    this->set_parameter(lift_function, input,
                        "Physics/"+PhysicsNaming::averaged_fan()+"/lift",
                        "0");

    if (lift_function.expression() == "0")
      std::cout << "Warning! Zero lift function specified!" << std::endl;

    this->set_parameter(drag_function, input,
                        "Physics/"+PhysicsNaming::averaged_fan()+"/drag",
                        "0");

    if (drag_function.expression() == "0")
      std::cout << "Warning! Zero drag function specified!" << std::endl;

    this->set_parameter(chord_function, input,
                        "Physics/"+PhysicsNaming::averaged_fan()+"/chord_length",
                        "0");

    if (chord_function.expression() == "0")
      libmesh_error_msg("Error! Zero chord function specified!" <<
                        std::endl);

    this->set_parameter(area_swept_function, input,
                        "Physics/"+PhysicsNaming::averaged_fan()+"/area_swept",
                        "0");

    if (area_swept_function.expression() == "0")
      libmesh_error_msg("Error! Zero area_swept_function specified!" <<
                        std::endl);

    this->set_parameter(aoa_function, input,
                        "Physics/"+PhysicsNaming::averaged_fan()+"/angle_of_attack",
                        "00000");

    if (aoa_function.expression() == "00000")
      libmesh_error_msg("Error! No angle-of-attack specified!" <<
                        std::endl);
  }

Member Data Documentation

template<class Viscosity >

libMesh::ParsedFunction<libMesh::Number> GRINS::AveragedFanBase< Viscosity >::aoa_function

protected

Definition at line 90 of file averaged_fan_base.h.

template<class Viscosity >

libMesh::ParsedFunction<libMesh::Number> GRINS::AveragedFanBase< Viscosity >::area_swept_function

protected

Definition at line 85 of file averaged_fan_base.h.

template<class Viscosity >

libMesh::ParsedFunction<libMesh::Number> GRINS::AveragedFanBase< Viscosity >::base_velocity_function

protected

Definition at line 64 of file averaged_fan_base.h.

template<class Viscosity >

libMesh::ParsedFunction<libMesh::Number> GRINS::AveragedFanBase< Viscosity >::chord_function

protected

Definition at line 80 of file averaged_fan_base.h.

template<class Viscosity >

libMesh::ParsedFunction<libMesh::Number> GRINS::AveragedFanBase< Viscosity >::drag_function

protected

Definition at line 76 of file averaged_fan_base.h.

template<class Viscosity >

libMesh::ParsedFunction<libMesh::Number> GRINS::AveragedFanBase< Viscosity >::lift_function

protected

Definition at line 75 of file averaged_fan_base.h.

template<class Viscosity >

libMesh::ParsedFunction<libMesh::Number> GRINS::AveragedFanBase< Viscosity >::local_vertical_function

protected

Definition at line 68 of file averaged_fan_base.h.

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The documentation for this class was generated from the following files:

• src/physics/include/grins/averaged_fan_base.h
• src/physics/src/averaged_fan_base.C