# Material Model

All of the properties of materials to be used in the simulation are defined in this branch.

Every volume (fluid or solid) must reference a material model. The same material model may be shared by any number of volumes. Any material models that are not referenced are ignored. AcuConsole has three pre-defined commonly used material models, Air, Aluminium and Water.

You can also import most of the standard material models from a repository. Apart from these, you can define a completely new material by right-clicking

.You can then define the individual properties of each material model. In the material model definition, the first parameter is Material Type which allows you to choose if the material defined is a fluid or solid.

- Density
- Any equation
- Specific Heat
- Temperature equations
- Viscosity
- Flow and turbulence equations
- Conductivity
- Temperature equations
- Viscoelastic
- Viscoelasticity equations
- Diffusivity*
- Species equations
- Porosity
- Flow with porous material

In general, it is advised to always define the viscosity properties even if the flow equations are not being solved. Some material properties, such as the conductivity model with a constant Prandtl number, may require the viscosity defined.

A fully defined material model can be exported so that it can be used for future simulations. To export a material model, right-click on the model and select Export.