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Pump Tutorial, original model
Figure: Turbo Blade Post; Pump Tutorial; The original model mesh – a wheel region. Colored by pressure; OpenFOAM Water Turbine CFD
Next: Inlet Boundary Conditions for Up: Fixed Value Velocity Family Previous: Fixed Velocity Varying with Contents Index
Fixed Velocity Varying with Patch Radius Boundary Condition
p:
boundaryField
{
".*_inlet"
{
type zeroGradient;
}
}
U: boundaryField
{
".*_inlet"
{
type turboFixedValue;
value $internalField;
artTransform on;
axis ( 0 0 1 );
r (
0.0
0.1
0.2
0.3
0.4
);
values (
(3.9303 -0.71184 3.47481)
(3.98608 -0.692647 3.6621 )
(4.03533 -0.650226 3.93062)
(4.00646 -0.604214 4.0422 )
(3.97447 -0.564151 4.08478)
);
}
}When parameter artTransform is on, the velocity components are of axial radial and tangential meaning. Otherwise, the velocity components are always Cartesian.
The inlet patch is virtually divided in to number of intervals. When parameter r is prescribed (with e.g. five height levels), the inlet patch is virtually divided into five radial intervals. Into each interval is prescribed corresponding value (linear interpolation is employed here).
Previous: Flow path geometry Up: TCFD – Input geometry Next: Thinking in components
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Geometry details
Let us start with a very famous quota which can be applied to general tasks. Nevertheless, in the field of geometry preparation for CFD purposes has significant importance:
“Everything should be made as simple as possible, but no simpler.â€
Albert Einstein
During a flow path geometry definition, one should keep in mind a simplicity of the geometry. For a simulation of a complex turbomachinery geometry, tiny details which does not significantly influence the flow should be removed from the flow path. Such details can not be captured by a reasonable amount of cells or can not be captured at all.The picture below depicts an (artificially created) example of such a detail.
INPUT RULE 2: Create the flow path geometry as simple as possible.