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Showing results 1 to 12 of 12 Search took 0.00 seconds. Search: Posts Made By: ghorrocks

Forum: CFX April 29, 2016, 08:55

Replies: 31 CFX 12.1: y+ value for SST Views: 29,611 Posted By ghorrocks Because you are using SST does NOT mean you then... Because you are using SST does NOT mean you then have to have y+=1. If you are using automatic wall functions it will automatically transition from wall functions to integrating to the wall. You...

Forum: CFX April 29, 2016, 04:37

Replies: 31 CFX 12.1: y+ value for SST Views: 29,611 Posted By ghorrocks y+<1 is a guide for what is required for SST to... y+<1 is a guide for what is required for SST to do integration to the wall with reasonable accuracy. But note that if you can use wall functions (and many flows can) then you are aiming for y+>11. So...

Forum: CFX April 28, 2016, 20:51

Replies: 31 CFX 12.1: y+ value for SST Views: 29,611 Posted By ghorrocks You cannot say from a simple y+ number whether... You cannot say from a simple y+ number whether your mesh is adequate. You should do a mesh sensitivity study to determine whether your mesh is accurate enough for your purposes or not.

Forum: CFX April 15, 2016, 07:01

Replies: 31 CFX 12.1: y+ value for SST Views: 29,611 Posted By ghorrocks The whole idea of CFD is that you do not need to... The whole idea of CFD is that you do not need to define these factors as the CFD model works it out based on the flow conditions. If you wish to apply all those loss factors then you are doing a...

Forum: CFX April 11, 2016, 01:47

Replies: 31 CFX 12.1: y+ value for SST Views: 29,611 Posted By ghorrocks My recommendation is to use SST unless you know a... My recommendation is to use SST unless you know a specific reason not to. In your case the rotational effects might cause a problem, but I would try with the curvature correction model with SST...

Forum: CFX April 10, 2016, 05:56

Replies: 31 CFX 12.1: y+ value for SST Views: 29,611 Posted By ghorrocks You cannot generalise with "SST is more accurate... You cannot generalise with "SST is more accurate in simulating the near-wall flow". It has strengths and weaknesses like all other models. Maybe you found one of its weaknesses. But really your...

Forum: CFX January 23, 2015, 05:33

Replies: 31 CFX 12.1: y+ value for SST Views: 29,611 Posted By ghorrocks If the boundary layer and free stream are... If the boundary layer and free stream are separable then it is easier to do them separately. Often they are not, so you have to do it all together. More advanced mesh convergence studies (see the...

Forum: CFX May 6, 2012, 06:38

Replies: 31 CFX 12.1: y+ value for SST Views: 29,611 Posted By ghorrocks You are looking for the CFX theory manual. The... You are looking for the CFX theory manual. The section on near wall modelling of turbuelnt flows. Just about any CFD textbook will describe basic turbulence model application and wall functions....

Forum: CFX April 7, 2010, 18:54

Replies: 31 CFX 12.1: y+ value for SST Views: 29,611 Posted By ghorrocks No problem - it looks like you have found the... No problem - it looks like you have found the answer to your question. Your explanation is not quite correct. Here are some points: There is no real upper limit on the y+ value you can use in...

Forum: CFX April 6, 2010, 18:48

Replies: 31 CFX 12.1: y+ value for SST Views: 29,611 Posted By ghorrocks You asked a general turbulence question which is... You asked a general turbulence question which is not specific to CFX. I am not going to write a turbulence text book to define where the 11 comes from for you. Your question is answered in any...

Forum: CFX April 5, 2010, 18:56

Replies: 31 CFX 12.1: y+ value for SST Views: 29,611 Posted By ghorrocks The log layer region and the significance of... The log layer region and the significance of y+=11 is explained in any turbulence text book, or even most general CFD modelling textbooks. Try "Turbulence Modelling for CFD" by Wilcox, for example.

Forum: CFX March 3, 2010, 16:56

Replies: 31 CFX 12.1: y+ value for SST Views: 29,611 Posted By ghorrocks I assume you are talking about meshing, that is... I assume you are talking about meshing, that is generating a mesh with an estimated y+ of 1? There has been no change there.

Showing results 1 to 12 of 12

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