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Showing results 1 to 13 of 13 Search took 0.00 seconds. Search: Posts Made By: ghorrocks

Forum: CFX March 23, 2014, 23:07

Replies: 56 SST turbulence model Views: 18,262 Posted By ghorrocks It is all in the documentation - see the theory... It is all in the documentation - see the theory manual.

Forum: CFX March 23, 2014, 16:49

Replies: 56 SST turbulence model Views: 18,262 Posted By ghorrocks Time scale factor is used by the solver to march... Time scale factor is used by the solver to march towards a solution. It is part of the numerical method. The residual is a measure of the accuracy of the solution of the equations.

Forum: CFX April 30, 2010, 06:24

Replies: 56 SST turbulence model Views: 18,262 Posted By ghorrocks OK, I will be interested in the results. OK, I will be interested in the results.

Forum: CFX April 29, 2010, 08:20

Replies: 56 SST turbulence model Views: 18,262 Posted By ghorrocks I would not fiddle those factors unless you know... I would not fiddle those factors unless you know exactly what they mean. The constants in the turbulence models are set by people a lot smarter than me so I don't like to change them. Almost...

Forum: CFX April 28, 2010, 09:06

Replies: 56 SST turbulence model Views: 18,262 Posted By ghorrocks The accuracy of the numerical discretisation is... The accuracy of the numerical discretisation is reduced, and numerical instability increases. That is problem dependent. You will have to find out for yourself on your simulation.

Forum: CFX April 26, 2010, 19:01

Replies: 56 SST turbulence model Views: 18,262 Posted By ghorrocks To fix this add additional prism layers until the... To fix this add additional prism layers until the transition is good. This results in large grids - but that's CFD for you. Yes, that is the way to go.

Forum: CFX April 7, 2010, 18:44

Replies: 56 SST turbulence model Views: 18,262 Posted By ghorrocks Why do you say you are well converged? Residuals... Why do you say you are well converged? Residuals of 1e-4 is loose convergence in many cases. You may need to converge tighter. Have you looked at...

Forum: CFX March 31, 2010, 07:00

Replies: 56 SST turbulence model Views: 18,262 Posted By ghorrocks What I mean by fluid time scale is the time taken... What I mean by fluid time scale is the time taken for the fluid to go from the inlet to the outlet. So if you fluid time scale is of the order of 1e-4s then you should be able to run physical time...

Forum: CFX March 30, 2010, 18:16

Replies: 56 SST turbulence model Views: 18,262 Posted By ghorrocks Not necessarily. But it can be. Why do... Not necessarily. But it can be. Why do you say this? I can't see a justification for this. For a steady run, once the residuals are converging nicely you should increase the physical...

Forum: CFX March 28, 2010, 06:29

Replies: 56 SST turbulence model Views: 18,262 Posted By ghorrocks In the release notes for V12.0 or V12.1 it should... In the release notes for V12.0 or V12.1 it should describe a method to turn this feature off and revert the previous behaviour. Is this what you are doing to obtain convergence?

Forum: CFX March 22, 2010, 14:54

Replies: 56 SST turbulence model Views: 18,262 Posted By ghorrocks I see. Do I understand you correctly in that you... I see. Do I understand you correctly in that you have assumed a frozen rotor approach, so does not include transient flow effects or blade passing effects in a complete fashion.

Forum: CFX March 22, 2010, 14:09

Replies: 56 SST turbulence model Views: 18,262 Posted By ghorrocks Often the turbulence transition model needs a... Often the turbulence transition model needs a transient approach to get convergence. Did you run transient? And are you sure of things like surface roughness, inlet turbulence levels and things...

Forum: CFX March 21, 2010, 16:53

Replies: 56 SST turbulence model Views: 18,262 Posted By ghorrocks You would have to follow up the references listed... You would have to follow up the references listed in the documentation for discussion of constant values. Why do you think the production of k is the cause of the problem? Have you looked at...

Showing results 1 to 13 of 13

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