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Showing results 1 to 4 of 4 Search took 0.01 seconds. Search: Posts Made By: ogloth

Forum: Main CFD Forum September 27, 2012, 02:30

Replies: 8 Question about the large expansion ratio influence to the numerical accuracy Views: 5,416 Posted By ogloth Good morning, How do you derive this... Good morning, How do you derive this rule and what does it guarantee if you fulfil this requirement? I had a quick look at the chapter you mentioned. What Peric does is trying to "save" the...

Forum: Main CFD Forum September 26, 2012, 10:57

Replies: 8 Question about the large expansion ratio influence to the numerical accuracy Views: 5,416 Posted By ogloth Is this true for the whole boundary layer, or... Is this true for the whole boundary layer, or only for the viscous sub-layer? In the log-layer the gradients are not as steep. Assume the following: We go from highly an-isotropic cells (ratio...

Forum: Main CFD Forum September 26, 2012, 09:22

Replies: 8 Question about the large expansion ratio influence to the numerical accuracy Views: 5,416 Posted By ogloth That is certainly true! Any layer you can save,... That is certainly true! Any layer you can save, however, saves a fair amount of computational time. Different regions of the flow field have different constraints on the stretching ratio. For a...

Forum: Main CFD Forum September 26, 2012, 08:42

Replies: 8 Question about the large expansion ratio influence to the numerical accuracy Views: 5,416 Posted By ogloth Hi, I haven't done excessive tests, but I... Hi, I haven't done excessive tests, but I found that for a low-Re turbulence model the difference in layer height should not be much more than a ratio of 1.2 -- even 1.5 as you suggest gives wrong...

Showing results 1 to 4 of 4

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