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How to determine number of prism layers and total height

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Old   July 12, 2016, 16:15
Default How to determine number of prism layers and total height
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Edward Kraft
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Like the title says, how do you know how many prism layers to use and total height of the prism layers? I was able to calculate my near wall length in order to get my y+ value to be less than 1 at the wall, but I'm not sure how to determine the total length. Attached are two images of my inlet face and a zoomed in picture of a prism layer transition. The cells of the last prism layer are much smaller than the first layer of tetras. Is that concerning? Thank you!
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File Type: png Inlet.PNG (26.8 KB, 4 views)
File Type: png Prism Layer Zoom.PNG (4.8 KB, 5 views)
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Old   July 13, 2016, 02:33
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After you have satisfied your first cell height to achieve whatever y+ criteria you need, choose as small a growth ratio that you can afford.

Then, you want a smooth and gradual transition between cell sizes. So choose the number of layers and total thickness such that the last prism layer is ~ the same size as the first tet.
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prism layers

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