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# Boundary conditions : compressible flow

D 9 février 2011

Some parameters denoted symbolic function can be defined as symbolic functions which can depend on x, y, z and sometimes t.

### Wall conditions

For compressible flows, wall conditions can be applied according to the type

###### ADIABATIC_WALL

wall condition with adiabatic energy condition

###### ISOTHERMAL_WALL

An additional WALL_TEMP=<value> is required as an uniform imposed temperature.

###### FLUXSET_WALL

An additional WALL_FLUX=<value> is required as an uniform imposed flux (W/m2).

For each of them, a WALL_VELOCITY=<vector> can be defined.

### Inflow conditions

There are currently two types of in-flow boundary conditions

###### Subsonic inflow
BLOCK:BOCO  FAMILY = my_mesh_tag  TYPE   = SUBSONIC_INLET  PI     = <symbolic function>  TI     = <symbolic function>   or  S  = <symbolic function>  DIR_X= <symbolic function>  DIR_Y= <symbolic function>  DIR_Z= <symbolic function> ENDBLOCK
###### Supersonic inflow
BLOCK:BOCO  FAMILY = my_mesh_tag  TYPE   = SUPERSONIC_INLET  PI       = <symbolic function>   ! (total or stagnation pressure)  TI       = <symbolic function>   ! (total or stagnation temperature)  MACH= <symbolic function>  DIR_X= <symbolic function>  DIR_Y= <symbolic function>  DIR_Z= <symbolic function> ENDBLOCK

Entropy S is defined by PS/RHO^gamma

Direction of velocity can also be defined directly with

  DIRECTION = (nx, ny, nz)    ! 3 <value> components

but only as constant components instead of DIR_* symbolic functions.

### Outflow conditions

Like inflow conditions, there are currently two types of out-flow boundary conditions

###### Subsonic outflow
BLOCK:BOCO  FAMILY = my_mesh_tag  TYPE   = SUBSONIC_OUTLET  P  = <symbolic function>   ! (static pressure) ENDBLOCK
###### Supersonic outflow

Although no user parameter is applied, the following definition must be specified.

BLOCK:BOCO  FAMILY = my_mesh_tag  TYPE   = SUPERSONIC_OUTLET ENDBLOCK

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