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Showing results 1 to 6 of 6 Search took 0.00 seconds. Search: Posts Made By: ghorrocks

Forum: CFX October 25, 2023, 18:02

Replies: 32 Negative pressure problem Views: 3,422 Posted By ghorrocks Yes, a negative pressure is numerically OK in... Yes, a negative pressure is numerically OK in incompressible flow, but will cause a crash in compressible flow. Are you getting negative absolute pressure or negative pressure? I assume you mean...

Forum: CFX July 7, 2014, 06:34

Replies: 32 Negative pressure problem Views: 3,422 Posted By ghorrocks If you have activated buoyancy the pressure... If you have activated buoyancy the pressure variable includes the static head. As long as density is constant then you do not need to account for static head. And this is why, unless you are...

Forum: CFX July 7, 2014, 05:59

Replies: 32 Negative pressure problem Views: 3,422 Posted By ghorrocks Gravity will only have an effect if something is... Gravity will only have an effect if something is a function of gravity. That is usually a variable density, either as multiphase, or density a function of temperature for buoyant flows. If nothing is...

Forum: CFX July 5, 2014, 08:35

Replies: 32 Negative pressure problem Views: 3,422 Posted By ghorrocks Well if you are trying to say that the pressure... Well if you are trying to say that the pressure in that region = 101-55*9.8 = -437kPa absolute then it will (almost) definitely cavitate. It appears like you have not run a cavitation model so then...

Forum: CFX July 5, 2014, 08:07

Replies: 32 Negative pressure problem Views: 3,422 Posted By ghorrocks If you are using a reference pressure of 1 bar... If you are using a reference pressure of 1 bar and your working fluid is water then you are miles away from cavitation. And if the simulation is accurate and it predicts a separation - then the...

Forum: CFX July 5, 2014, 06:46

Replies: 32 Negative pressure problem Views: 3,422 Posted By ghorrocks The low pressure region is clearly a separation. ... The low pressure region is clearly a separation. I can also see your contour lines are jagged which is a sure sign of your mesh being too coarse. Have you read this FAQ?...

Showing results 1 to 6 of 6

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