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with origin in (0, 0, 0)
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Averaging
At the moment only the following quantities are sampled: the pressure p, the absolute velocity U (no circumferential component), the relative velocity URel (no circumferential component), the absolute velocity magnitude magU and the relative velocity magnitude magURel.
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).
Figure: The meaning of inletOutlet boundary condition
U:
boundaryField
{
".*_outlet"
{
type inletOutlet;
value $internalField;
inletValue uniform (0 0 0);
}
}
k, omega, epsilon, T:
boundaryField
{
".*_outlet"
{
type inletOutlet;
value $internalField;
inletValue uniform 0;
}
}
Previous: Boundary condition: Inlet Up: TCFD – GUI Setup Next: Initial conditions
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Boundary condition: Outlet
The outlet boundary conditions are displayed in Figure ![[*]](https://www.cfdsupport.com/wp-content/uploads/2022/02/crossref.png "Node45 28")
. There are two possible ways how to prescribe the desired behaviour of the simulated fields at the outlet from the computational domain: Prescribing a fixed pressure or adjusting the pressure based on the outlet velocity. The choice of the boundary conditions is done by selection of one item of the drop-down list “Outlet BC”. The rest of the panel is then adjusted to the user’s choice.
The boundary condition “Fixed pressure” has only one editable property, of the same name.
The boundary condition “Outlet vent” adjusts the pressure based on the velocity: 
, where 
is the so called resistance. The parameters are
. There are two possible ways how to prescribe the desired behaviour of the simulated fields at the outlet from the computational domain: Prescribing a fixed pressure or adjusting the pressure based on the outlet velocity. The choice of the boundary conditions is done by selection of one item of the drop-down list “Outlet BC”. The rest of the panel is then adjusted to the user’s choice.
The boundary condition “Fixed pressure” has only one editable property, of the same name.
The boundary condition “Outlet vent” adjusts the pressure based on the velocity: , where is the so called resistance. The parameters are
Figure: Plugin TCFDSource – outlet boundary conditions: Fixed pressure (top), and outlet vent (bottom).
The boundary conditions “Mass flow rate”, “Volumetric flow rate” and “Fixed velocity” can be set for:
- “Total pressure” boundary condition at the inlet
- One-component mesh or frozen rotor setup, i.e., number of “mxp” for every outlet/inletInterface is set to
.
Previous: Boundary condition: Inlet Up: TCFD – GUI Setup Next: Initial conditions