Rough wall
1 Attachment(s)
Hello everybody,
Do you have any experience about the rough wall treatment. I want to run simulations with smooth and rough wall : it deals a throttle pressure loss. My problem is to know if I can set as a CFX roughness height hs, the roughness height that I got from a test measure. my measure corresponds to a roughness depth of 1.6 um. So Can I set hs=1.6 um in CFX? Nota : Sandgrain diameter is hs in CFX : have a look at cfx help about rough wall treatment. Thanks in advance nellio75 |
Try the following:
1) Insert a 'Boundary' within your Domain 2) Change 'Boundary type' to 'Wall' 3) Goto 'Boundary Details' tab 4) Expand the 'Wall Roughness' option 5) insert your hs in the 'Roughness Height' in meters |
height of the sand grain
Thanks for your reply but I'm afraid my question wasn't very understandable : if you have looked at the attached file, I 'm looking for an equivalence between a real measure of a wall roughness and the diameter of a sand grain used in CFX: the sand grain layer is used in CFX to modelise the roughness. Anyway, in the meantime, I've found an extract of a book where there's an example of different real roughness. I think it will be sufficient for the purpose of my study. So I can close my question for this forum.
Anyway, I thank you for having paid attention of my question. Best Regards nellio75 |
Hi nellio75.
glad you've found a possible solution. would you mind sharing info on the real roughness please? |
1 Attachment(s)
Please find attached the extract of the book as asked.
Best Regards Nellio75 |
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