Ityp = 0
Block Format Keyword This law enables to model a gas inlet condition by providing data from stagnation point. Gas is supposed to be a perfect gas. 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) |
---|---|---|---|---|---|---|---|---|---|
node_IDv | Cd | ||||||||
fct_ID | |||||||||
fct_IDp | |||||||||
Blank Format | |||||||||
fct_IDk | fct_ID | ||||||||
fct_IDT | fct_IDv |
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 stagnation
density. (Real) |
||
Reference density used in
E.O.S (equation of state). Default (Real) |
||
Ityp | Boundary condition type.
1
(Integer) |
|
Psh | Pressure shift. 2 (Real) |
|
FscaleT | Time scale factor. 3 (Real) |
|
node_IDv | Node identifier for velocity computation. 3
(Integer) |
|
Perfect gas
constant. (Real) |
||
Cd | Discharge coefficient.
5 Default = 0.0 (Real) |
|
fct_ID | Function
identifier for stagnation density.
3
(Integer) |
|
fct_IDp | Function
identifier for stagnation pressure.
3
(Integer) |
|
Initial stagnation
pressure. 3 (Real) |
||
Initial turbulent
energy. (Real) |
||
Initial turbulent
dissipation. (Real) |
||
fct_IDk | Function
identifier for turbulence
modeling.
(Integer) |
|
fct_ID | Function
identifier for turbulence
modeling.
(Integer) |
|
Turbulent viscosity
coefficient. Default = 0.09 (Real) |
||
Diffusion coefficient for
k 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. 3
6
(Integer) |
|
fct_IDQ | Function
identifier for inlet heat
flux. 3
6
(Integer) |
Comments
- Provided gas state from stagnation
point
is used to compute inlet gas state.A set of equations including Total Enthalpy formulation, Adiabatic Law and Equation of State allows for the complete definition of the inlet state:
(1) (2) (3) - 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 .
- Inlet velocity is used in Bernoulli theory, fixed velocity.
- Discharge coefficient accounts for
entry loss and depends on shape orifice.
Figure 1. - With thermal modeling, all thermal data ( , ...) can be defined with /HEAT/MAT.
- It is not possible to use this boundary material law with multi-material ALE /MAT/LAW37 (BIPHAS) and /MAT/LAW51 (MULTIMAT).