Number of nodes for LES And DES
Hey guys,
I have heard that there are some quantitative equation( as rule of thumb) between number of nodes and "Re" number for DES and LES methods. Do you know anything about this matter? |
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DNS for the same flows is around Re^3 and Re^3.6 Dont' know about DES, sorry. you can obtain those figures using the definition of kolmogrov lenghtscale for the free shear and the friction velocity for the wall bounded flow. |
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My case is a NREL wind turbine and the average Re in my case is between 500,000 to 900,000( the Reynolds is calculated locally according to the local air velocity and chord). The average chord is 0.5 m and the blade span is 5m. I've put 53 nodes in chordwise and 83 in spanwise directions and based on CFX Post results my Y+<1. I paid attention to have finer mesh near the blade and further away mesh is coarse. the total number of nodes are about 5. million. for the case above, do you have any suggestion about the number of nodes I need ? Thanks a lot |
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but 50 pts chordwise and 83 spanwise looks a little bit coarse, have you done mesh indipencece studies yet? just as a rule of thumb: y+ < 1 ok and also x+ < 100 and z+ < 20 |
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