# cfx one of notice message

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 November 20, 2008, 21:42 cfx one of notice message #1 canter Guest   Posts: n/a | ****** Notice ****** | | This is a multiphase simulation with a compressible phase. | | Total pressure (used for post-processing or if total pressure | | is specified at a boundary) is calculated assuming all phases | | are incompressible. what 's means? can not calculate compressible phase ?

 November 21, 2008, 06:45 Re: cfx one of notice message #2 Bart Guest   Posts: n/a Yes it can. But when specifying total pressure on boundary conditions (inlet) you have to make sure the local velocities are low (very much subsonic) for the compressible phase. In that way even for the compressible phase the total pressure is ok as boundary condition. In principle ratio of total pressure and static pressure in compressible flows depends on the Mach number. If the Mach number is low (<0.1) you can use the incompressible Bernouille equation (there is a compressible bernouille equation).

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