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Showing results 1 to 8 of 8 Search took 0.00 seconds. Search: Posts Made By: ghorrocks

Forum: CFX April 4, 2022, 07:17

Replies: 21 Stopped in routine ENFORCE_BOUNDS Views: 15,066 Posted By ghorrocks That is because it is the source of 90% of the... That is because it is the source of 90% of the problems on this forum.

Forum: CFX February 27, 2019, 05:42

Replies: 21 Stopped in routine ENFORCE_BOUNDS Views: 15,066 Posted By ghorrocks If the simulation is unstable then a very small... If the simulation is unstable then a very small time step will be required. If the simulation is not correctly set up then it will diverge no matter what time step you use. You are doing a very...

Forum: CFX February 26, 2019, 03:40

Replies: 21 Stopped in routine ENFORCE_BOUNDS Views: 15,066 Posted By ghorrocks You are using a complex and custom material... You are using a complex and custom material model. They often cause strange errors and are often very hard to converge. I see you have set a very small timescale factor, which suggests you have...

Forum: CFX February 25, 2019, 04:44

Replies: 21 Stopped in routine ENFORCE_BOUNDS Views: 15,066 Posted By ghorrocks It is unusual for multiprocessor to cause this... It is unusual for multiprocessor to cause this type of error, but not impossible. It still suggests numerical instability, so the FAQ is applicable for that.

Forum: CFX February 24, 2019, 23:30

Replies: 21 Stopped in routine ENFORCE_BOUNDS Views: 15,066 Posted By ghorrocks You have a bounds error on the Absolute Pressure.... You have a bounds error on the Absolute Pressure. The highest pressure CFX can handle is very high, 1E10Pa I suspect, but the absolute pressure cannot be zero or negative in compressible simulations....

Forum: CFX January 12, 2011, 05:10

Replies: 21 Stopped in routine ENFORCE_BOUNDS Views: 15,066 Posted By ghorrocks Your expert parameter turns the solving of the... Your expert parameter turns the solving of the volume fraction equation off. You are not going to get far when you are not solving the equations. I have no idea why pressure is not in the output...

Forum: CFX December 23, 2010, 06:21

Replies: 21 Stopped in routine ENFORCE_BOUNDS Views: 15,066 Posted By ghorrocks Mesh quality requirements are different for... Mesh quality requirements are different for different physics models. The rules of thumb for single phase flow are often not appropriate for multi phase flow. I would spend some time to get the mesh...

Forum: CFX December 22, 2010, 17:21

Replies: 21 Stopped in routine ENFORCE_BOUNDS Views: 15,066 Posted By ghorrocks Your simulation is not converging well. Need to... Your simulation is not converging well. Need to improve the numerical stability - smaller timesteps, better mesh quality and check the physics.

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