MAT_FLUID
FE
SPH
FE
SPH
Material properties
*MAT_FLUID
"Optional title"
mid, $\rho$, $K$, $\mu$, $p_c$, eosid
$G$
"Optional title"
mid, $\rho$, $K$, $\mu$, $p_c$, eosid
$G$
Parameter definition
Variable
Description
mid
Unique material identification number
$\rho$
Density
$K$
Linear bulk modulus
$\mu$
Viscosity
$p_c$
Pressure cut-off
eosid
Equation-of-state ID
$G$
Artificial shear modulus
Description
This is a simple fluid model. It can be combined with an equation-of-state for a non-linear pressure-volume relationship. If not using an equation-of-state the pressure $p$ is defined as:
$p = \mathrm{max} (p_c, -K \varepsilon_v - \mu \dot\varepsilon_v)$
where $\varepsilon_v$ is the volumetric strain. An artifical shear stiffness can be used to stabilize Finite Elements using this material. The deviatoric stresses are then:
$\mathbf{\sigma}_{dev} = 2 G \mathbf{\varepsilon}_{dev}$
