/MAT/LAW151 (MULTIFLUID)
Block Format Keyword Simulation of multifluid compressible flows by defining a submaterial and initial volume fraction.
Format
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
/MAT/LAW151/mat_ID or /MAT/MULTIFLUID/mat_ID | |||||||||
mat_title | |||||||||
Blank | |||||||||
mat_ID1 | Vol_frac1 | ||||||||
etc | etc | ||||||||
mat_IDN | Vol_fracN |
Definition
Field | Contents | SI Unit Example |
---|---|---|
mat_ID | Material identifier (Integer, maximum 10 digits) |
|
mat_title | Material title (Character, maximum 100 characters) |
Example (Multi Air)
#RADIOSS STARTER
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/UNIT/1
unit for mat
g mm ms
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
#- 2. MATERIALS:
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/MAT/MULTIFLUID/40/1
MULTI_AIR
# initial air
4 1.0
5 0.0
/ALE/MAT/40
# Modif. factor.
0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/MAT/MULTIFLUID/50/1
MULTI_WATER
# initial water
4 0.0
5 1.0
/ALE/MAT/50
# Modif. factor.
0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/MAT/HYD_VISC/4/1
AIR_LAW6
# RHO_0
1.22E-6
# Knu Pmin
0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/EOS/POLYNOMIAL/4/1
AIR
# C0 C1 C2 C3
0 0 0 0
# C4 C5 E0 Psh RHO_0
.4 .4 .25 0 1.22E-6
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/MAT/HYD_VISC/5/1
Water_LAW6
# RHO_0
.001
# Knu Pmin
0 0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/EOS/POLYNOMIAL/5/1
WATER - LINEAR
# C0 C1 C2 C3
0 2250 0 0
# C4 C5 E0 Psh RHO_0
0 0 0 0 .001
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
#ENDDATA
Comments
- Compatible material laws are LAW6: hydrodynamic law with any equation of state (/EOS), and LAW5 (explosive material).
- The sum of volume fraction input for all materials must be equal to 1; except when the volume fraction fields are initialized using the /INIVOL option.
- Eulerian and ALE solutions are available.
- LAW151 uses a colocated finite volume integration solver.
- Planar and axisymmetric 2D simulations can use /QUAD and /TRIA elements.
- 3D simulations can use /BRICK and /TETRA4 elements.
- Default boundary conditions are sliding wall. Non-reflecting outlet and inlets can be used with /EBCS/FLUXOUT and /EBCS/INLET options.
- Initial velocities can be set using /INIVEL/FVM option.
- Initial volume fractions can be set using the /INIVOL card.
- Fluid structure interaction interfaces TYPE1 and TYPE18 (/PARITH/OFF only) are compatible with LAW151.
- Direct contact (node to node coincidence) between a Lagrangian part and an EULER or ALE LAW151 part can be used for small displacement FSI problems.
- For stable results, the time step scale factor should be less than 0.5.