Encyclopaedia Index

PARSOL for inviscid flow

This work by VA Semin, of CHAM's development team, by means of PHOENICS version 3.1

The pictures represent aspects of the simulation of inviscid flow within a curved "turn-around duct". A coarse-grid is used at first, in order to show that PARSOL still allows a good solution to be obtained.

Comparisons are shown of the pressure distributions which are computed both with and without the use of PARSOL.

the geometry of the duct, seen in the VR-Viewer.

The coarse grid

The pressure distribution when PARSOL is used.

The exact solution of the inviscid=flow equations implies that the pressure distribution should be symmetrical about a horizontal plane, and that the pressure at the outlet should be the same as that at the inlet.

The computed results approximate to these requirement quite closely.

The jagged representation of the curved surface is a deficiency of the display module then used. The solver module, however, takes the "cut-cells" properly into account.
The display deficiency has since been removed (see below).

The final picture for this grid shows the far-from-symmetrical pressure field which results when PARSOL is NOT used. The pressure difference between inlet and outlet is considerable.

Use of PARSOL evidently brings a great advantage.

The pressure field without PARSOL.

A further calculation has been carried out with a somewhat finer grid; and the results are displayed by means of the improved viewer.

the finer grid

the extremely symmetrical pressure distribution when PARSOL is used

the far less symmetrical pressure distribution when PARSOL is NOT used