Learning Forum

[azizi0407]

HinnI get this warning.nnWarning: More than one cell is equidistant from the specified reference pressure location. Reference pressure location will be chosen automatically; else specify a unique off-symmetry reference pressure location.nnWhat does this mean?n

[Keyur Kanade]

For incompressible flows that do not involve any pressure boundaries ANSYS Fluent adjusts the gauge pressure field after each iteration to keep it from floating. This is done using the pressure in the cell located at (or nearest to) the reference pressure location. The pressure value in this cell is subtracted from the entire gauge pressure field; as a result the gauge pressure at the reference pressure location is always zero. If pressure boundaries are involved the adjustment is not needed and the reference pressure location is ignored.The reference pressure location is by default the cell center at or closest to (0 0 0). There may be cases in which you might want to move the reference pressure location perhaps locating it at a point where the absolute static pressure is known (for example if you are planning to compare your results with experimental data). To change the location enter new (X Y Z) coordinates for Reference Pressure Location in the Operating Conditions Dialog Box.So you don't need to specify the reference pressure location. In your case the specified point is exactly half-way between two points so Fluent has used the default location (0 0 0) instead. This is acceptable as it is not necessary to move the location. So your results should be reliable and absolute pressure predictions will not be affected.n

[Keyur Kanade]

Please see help manual for more details about these commands. nn

[azizi0407]

HinnThanks for the explainations.n