Block Format Keyword Describes the linear equation of state
with initial pressure and bulk modulus.
Format
(1) |
(2) |
(3) |
(4) |
(5) |
(6) |
(7) |
(8) |
(9) |
(10) |
/EOS/LINEAR/mat_ID/unit_ID |
eos_title |
|
B |
Psh |
|
|
Definition
Field |
Contents |
SI Unit
Example |
mat_ID |
Material
identifier. (Integer, maximum 10 digits)
|
|
unit_ID |
Unit Identifier. (Integer, maximum 10 digits)
|
|
eos_title |
EOS
title. (Character, maximum 100 characters)
|
|
|
Initial
pressure. (Real)
|
|
B |
Bulk
modulus. (Real)
|
|
Psh |
Pressure
shift. (Real)
|
|
|
Reference
density. (Real)
|
|
Example
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/UNIT/1
unit for mat
kg m s
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/MAT/LAW06/7/1
law06
# RHO_I
2.33e-3
# NU PMIN
0.22 -0.02
/EOS/LINEAR/7/1
linear EOS (Artificial data)
# P0 B PSH RHO0
1 10.0 0.0 2.33e-3
/ALE/MAT/7
# Flrd
0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
#enddata
Comments
- Linear EOS has the following
form:(1)
Where,
(2)
which can be derived from a polynomial
EOS:
(3)
Where,
-
-
-
- Bulk modulus is usually
estimated as:(4)
Where,
is the initial sound speed.
- Psh parameter
enables to shift output pressure. Output pressure will also be a relative
pressure
.
- Equations of state are used by
Radioss to compute the hydrodynamic pressure and are
compatible with the material laws:
- /MAT/LAW3 (HYDPLA)
- /MAT/LAW4 (HYD_JCOOK)
- /MAT/LAW6 (HYDRO or HYD_VISC)
- /MAT/LAW10 (DPRAG1)
- /MAT/LAW12 (3D_COMP)
- /MAT/LAW49 (STEINB)
- /MAT/LAW102 (DPRAG2)
- /MAT/LAW103 (HENSEL-SPITTEL)