Description

Base class for materials about thermal problems, for FEA problems involving temperature, heat flow, etc.

It contains properties and constitutive laws for thermal problems PDEs of the type Z * dT/dt + div(q_flux) = q_source Children classes must implement the interface q_flux = f(grad_T,T), to [Z] = f(grad_T,T) and to the tangent modulus [C] in the linearization of q_flux. The q_source is assumed provided by optional ChLoaderHeatVolumetricSource, and same for boundary conditions.

#include <ChMaterial3DThermal.h>

Inheritance diagram for chrono::fea::ChMaterial3DThermal:

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Collaboration diagram for chrono::fea::ChMaterial3DThermal:

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Public Member Functions
virtual void	ComputeHeatFlux (ChVector3d &q_flux, const ChVector3d grad_T, const double T, ChFieldData data_per_point, ChElementData data_per_element)=0
	Compute heat flux vector q_flux from a temperature gradient grad_T q_flux = f(grad_T) This MUST be implemented by children classes. More...

virtual void	ComputeTangentModulus (ChMatrix33d &tangent_matrix, const ChVector3d grad_T, const double T, ChFieldData data_per_point, ChElementData data_per_element)=0
	Computes the tangent modulus [C] in the linearization of q_flux = f(grad_T) about temperature: δq_flux = [C] δgrad_T This MUST be implemented by children classes. More...

virtual void	ComputeDtMultiplier (double &Dt_multiplier, const double T, ChFieldData data_per_point, ChElementData data_per_element)=0
	Computes the Z multiplier in Z*dT/dt + div(q_flux) = q_source: This MUST be implemented by children classes. More...

Public Member Functions inherited from chrono::fea::ChMaterialPoisson
ChMatrixDynamic &	ConstitutiveMatrix ()
	The constitutive matrix [C] to compute the bilinear form in the weak formulation. More...

virtual double	Get_DtMultiplier ()
	Get the rho multiplier for the 'rho dP/dt term', if any (default, none)

Public Member Functions inherited from chrono::fea::ChMaterial3DDensity
	ChMaterial3DDensity (double density=1000)

virtual void	SetDensity (double density)
	Set the density of the material, in kg/m^2.

virtual double	GetDensity () const
	Get the density of the material, in kg/m^2.

Public Member Functions inherited from chrono::fea::ChMaterial
virtual std::unique_ptr< ChFieldData >	CreateMaterialPointData () const
	Implement this if the material needs custom data per material point, returning a std::make_unique<ChFieldDataCustom>() where ChFieldDataCustom is your custom class with aditional states/properties per-point.

Additional Inherited Members
Protected Attributes inherited from chrono::fea::ChMaterialPoisson
ChMatrixDynamic	constitutiveMatrix

Protected Attributes inherited from chrono::fea::ChMaterial3DDensity
double	m_density

Member Function Documentation

◆ ComputeDtMultiplier()

virtual void chrono::fea::ChMaterial3DThermal::ComputeDtMultiplier	(	double &	Dt_multiplier,
		const double	T,
		ChFieldData *	data_per_point,
		ChElementData *	data_per_element
	)

pure virtual

Computes the Z multiplier in Z*dT/dt + div(q_flux) = q_source: This MUST be implemented by children classes.

Parameters

Dt_multiplier	the Z term in Z*dT/dt + div(q_flux) = q_source
T	current temperature (not used here)
data_per_point	pointer to auxiliary data (ex states), if any, per quadrature point
data_per_element	pointer to auxiliary data (ex states), if any, per element

Implemented in chrono::fea::ChMaterial3DThermalNonlinear, and chrono::fea::ChMaterial3DThermalLinear.

◆ ComputeHeatFlux()

virtual void chrono::fea::ChMaterial3DThermal::ComputeHeatFlux	(	ChVector3d &	q_flux,
		const ChVector3d	grad_T,
		const double	T,
		ChFieldData *	data_per_point,
		ChElementData *	data_per_element
	)

pure virtual

Compute heat flux vector q_flux from a temperature gradient grad_T q_flux = f(grad_T) This MUST be implemented by children classes.

Parameters

q_flux	output heat flux
grad_T	current temperature gradient
T	current temperature
data_per_point	pointer to auxiliary data (ex states), if any, per quadrature point
data_per_element	pointer to auxiliary data (ex states), if any, per element

Implemented in chrono::fea::ChMaterial3DThermalNonlinear, and chrono::fea::ChMaterial3DThermalLinear.

◆ ComputeTangentModulus()

virtual void chrono::fea::ChMaterial3DThermal::ComputeTangentModulus	(	ChMatrix33d &	tangent_matrix,
		const ChVector3d	grad_T,
		const double	T,
		ChFieldData *	data_per_point,
		ChElementData *	data_per_element
	)

pure virtual

Computes the tangent modulus [C] in the linearization of q_flux = f(grad_T) about temperature: δq_flux = [C] δgrad_T This MUST be implemented by children classes.

It is also diffusivity matrix in a diffusion PDE.

Parameters

tangent_matrix	output [C] tangent as δq_flux = [C] δgrad_T
grad_T	current temperature gradient
T	current temperature
data_per_point	pointer to auxiliary data (ex states), if any, per quadrature point
data_per_element	pointer to auxiliary data (ex states), if any, per element

Implemented in chrono::fea::ChMaterial3DThermalNonlinear, and chrono::fea::ChMaterial3DThermalLinear.

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

/builds/uwsbel/chrono/src/chrono/fea/ChMaterial3DThermal.h

Description

Public Member Functions

Additional Inherited Members

Member Function Documentation

◆ ComputeDtMultiplier()

◆ ComputeHeatFlux()

◆ ComputeTangentModulus()