# How to apply face pressures

(Difference between revisions)
 Revision as of 14:23, 12 May 2010 (view source)Kazem (Talk | contribs)← Older edit Latest revision as of 08:57, 3 May 2012 (view source)Kazem (Talk | contribs) Line 1: Line 1: − Posietive and/or negative face pressure are added using a '''condition''' called ''Face3D'', for displacement as unknown, or ''FaceVel3D'', for velocity as unknown. + Neumann boundary condition are applied using following conditions in KRATOS, − This '''condition''' uses two variables called ''NEGATIVE_FACE_PRESSURE'' and ''POSITIVE_FACE_PRESSURE'' to read assigned pressure values on the nodes of the condition and + − therefore it is necessaey to add them as varibles in the python file. + FACE2D(3D) or FACEPRESSURE2D(3D) in STRUCTURAL application − ''Face3D'' and ''FaceVel3D'',as linear triangular conditin, could be fined in ''custom_conditions'' of ''structural application''. + Fluid3DNeumann or Monolithic2DNeumann(and 3D) in INCOMPRESSIBLE application. + + All of them take external pressures, through variables like, EXTERNAL_PRESSURE, PRESSURE,NEGATIVE_FACE_PRESSURE and POSITIVE_FACE_PRESSURE, and then + compute the NORMAL and apply the calculated forces on the nodes. + + '''Fluid3DNeumann''' is written to work with '''Fractional step''' solvers while '''Monolithic2DNeumann''' is written to work with mixed u-p systems. + The reader is supposed to have a look on these conditions and choose the one tha tis more appropriate to his/her needs.

## Latest revision as of 08:57, 3 May 2012

Neumann boundary condition are applied using following conditions in KRATOS,

``` FACE2D(3D) or  FACEPRESSURE2D(3D) in STRUCTURAL application
Fluid3DNeumann or Monolithic2DNeumann(and 3D) in INCOMPRESSIBLE application.
```

All of them take external pressures, through variables like, EXTERNAL_PRESSURE, PRESSURE,NEGATIVE_FACE_PRESSURE and POSITIVE_FACE_PRESSURE, and then compute the NORMAL and apply the calculated forces on the nodes.

Fluid3DNeumann is written to work with Fractional step solvers while Monolithic2DNeumann is written to work with mixed u-p systems. The reader is supposed to have a look on these conditions and choose the one tha tis more appropriate to his/her needs.