/MAT/LAW6 (HYDRO or HYD_VISC)
Block Format Keyword Describes a fluid material. Pressure is computed using Equation of State provided by definition of /EOS option.
Format
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
/MAT/LAW6/mat_ID/unit_ID or /MAT/HYDRO/mat_ID/unit_ID or /MAT/HYD_VISC/mat_ID/unit_ID | |||||||||
mat_title | |||||||||
Pmin |
Definition
Field | Contents | SI Unit Example |
---|---|---|
mat_ID | Material identifier. (Integer, maximum 10 digits) |
|
unit_ID | Unit identifier. (Integer, maximum 10 digits) |
|
mat_title | Material title. (Character, maximum 100 characters) |
|
Initial density. (Real) |
||
Reference density used in E.O.S (equation of
state). Default = (Real) |
||
Kinematic viscosity. (Real) |
||
Pmin | Pressure cut-off. Default = -1.0 x 1020 (Real) |
Example (Air)
#RADIOSS STARTER
/UNIT/1
unit for mat
kg m s
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/MAT/HYDRO/4/1
AIR
# RHO_I RHO_0
1.22 0
# Knu Pmin
1.5E-5 0
/EOS/POLYNOMIAL/4/1
AIR
# C0 C1 C2 C3
0 0 0 0
# C4 C5 E0 Psh RHO_0
0.4 0.4 253300 0 1.22
/EULER/MAT/4
# Modif. factor.
0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
#enddata
/END
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
Comments
-
Where,
- No turbulence
- Deviatoric stress tensor
- Deviatoric strain tensor
- Equation of state for hydrodynamic pressure has to be prescribed via the /EOS card.
- In case of a linear material with a
volumetric dilatation:
and
and
then:
If , then l=; so
Where,- Dilatation coefficient
- Dilatation
- All thermal data ( ) can be defined with keyword /HEAT/MAT.
- If using LAW6 coupled with LAW37 for
liquid phase (without gas phase), the
compatibility of the liquid EOS is:
- for /MAT/LAW37 (BIPHAS)
- for LAW6 via a polynomial EOS defined as in the Example above.
with
then,
- If using LAW6 coupled with LAW37 for gas
phase (without liquid phase), the compatibility of
the gas EOS is:
- for LAW37
- for LAW6, via the /EOS/IDEAL-GAS equation of state.
Where, is the energy per unit volume.