Ityp = 2
Block Format Keyword This law enables to model a material inlet/outlet by directly imposing its state. Input card is similar to /MAT/LAW11 (BOUND), but introduces two new lines to define turbulence parameters.
Format
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
/MAT/B-K-EPS/mat_ID/unit_ID | |||||||||
mat_title | |||||||||
Ityp | Psh | FscaleT |
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
---|---|---|---|---|---|---|---|---|---|
Blank Format | |||||||||
fct_ID | |||||||||
fct_IDp | P0 | ||||||||
fct_IDE | E0 | ||||||||
fct_IDk | fct_IDe | ||||||||
fct_IDT | fct_IDQ |
Definitions
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.
3 (Real) |
||
Reference density
used in E.O.S (equation of state). Default = (Real) |
||
Ityp | Boundary condition
type. 1
(Integer) |
|
Psh | Pressure shift.
3 (Real) |
|
FscaleT | Time scale factor. 3 (Real) |
|
fct_ID | Function
identifier for
boundary density. 3
(Integer) |
|
fct_IDp | Function
identifier for
boundary pressure.. 3
(Integer) |
|
P0 | Initial pressure.
3 (Real) |
|
fct_IDE | Function
identifier for boundary
energy. 3
(Integer) |
|
E0 | Initial energy.
3
6 (Real) |
|
Initial turbulent
energy. (Real) |
||
Initial turbulent
dissipation. (Real) |
||
fct_IDk | Function
identifier for turbulence modeling.
(Integer) |
|
fct_ID | (Optional) Function
identifier for turbulence modeling.
(Integer) |
|
Turbulent viscosity
coefficient. Default = 0.09 (Real) |
||
Diffusion
coefficient for
parameter. Default = 1.00 (Real) |
||
Diffusion
coefficient for
parameter Default = 1.30 (Real) |
||
Ratio between
Laminar Prandtl number (Default 0.7) and turbulent Prandtl
number (Default 0.9). (Real) |
||
fct_IDT | Function
identifier for inlet temperature.
(Integer) |
|
fct_IDQ | Function
identifier for inlet heat flux.
(Integer) |
Example (Gas)
#RADIOSS STARTER
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/MAT/B-K-EPS/3
GAS INLET (unit: kg_m_s)
# RHO_I
.3828
# ITYP Psh Fscale_T
2
#blank line
# fct_RHO
1
# fct_P P_0
0
# fct_E E_0
1 253300
# Rho0k0 Rho0Eps0 fct_k fct_eps
20 0 1 0
# Cmu Sigma-k Sigma-epsilon Pr/Prt
0 0 0 0
# fct_T fct_Q
/ALE/MAT/3
# Modif. factor.
0
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
/FUNCT/1
CST
# X Y
0 1
1.0E20 1
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
#enddata
/END
#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|
Comments
- Provided state is directly
imposed to inlet boundary elements. This leads to the following inlet state:
(1) (2) (3) With this formulation, you may impose velocity on boundary nodes to be consistent with physical inlet velocity (/IMPVEL). /MAT/LAW11 - Ityp=0 and 1, are based on material state from stagnation point, where you do not need to imposed an inlet velocity.
- The Psh parameter enables shifting the output pressure which also becomes P-Psh. If using , the output pressure will be , with an initial value of 0.0.
- If no function is defined, then related quantity ( , or Q) remains constant and set to its initial value. However, all input quantities ( , and Q) can be defined as time dependent function using provided function identifiers. Abscissa functions can also be scaled using FscaleT parameter which leads to use instead of .
- With thermal modeling, all thermal data ( , …) can be defined with /HEAT.
- It is not possible to use this boundary material law with multi-material ALE /MAT/LAW37 (BIPHAS)) and /MAT/LAW51 (MULTIMAT).
- Specific volume energy
E is defined as
, Where
- Internal energy. It can be output using /TH/BRIC.
Specific mass energy e is defined as . This leads to . Specific mass energy e can be output using /ANIM/ELEM/ENER. This may be a relative energy depending on user modeling.