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Yesterday, 05:46 |
Y+ = { 0, nan } in results
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#1 |
Member
Giovanni Bettega
Join Date: Sep 2014
Posts: 34
Rep Power: 12 |
Hello forum,
I made a SU2 run in a simple domain in which air (ideal gas) is flowing. It enters the domain @ 400K and exchanges heat with environment through convection realizing at the fluid domain walls (film coeff 100, Tfar 300; all MKS). Mesh is tetrahedral with inflation layers (SST model with wall functions). In the results file (ASCII Tecplot) I found, for an => intentionally <= not well converged run, two lines, in which for a point Y+ = 0.0, and in a point Y+ = not a number. See below. TITLE = "Visualization of the solution" VARIABLES = [...] ZONE NODES= 23484, ELEMENTS= 58624, DATAPACKING=POINT, ZONETYPE=FEBRICK 8.604952e-01 6.812059e-01 5.743822e-02 [...] 0.000000e+00 2.085533e+03 1.209390e+00 7.550436e-01 4.031287e-02 [...] nan 1.300315e+03 How should I interpret these findings? I would like to stress that this is a partially converged run, intentionally. Thanks Giovanni |
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Yesterday, 13:42 |
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#2 |
Senior Member
bigfoot
Join Date: Dec 2011
Location: Netherlands
Posts: 676
Rep Power: 21 |
Y+=0 can occur in corner nodes where the wall shear stress is zero. The nan value is more alarming, do you know where this is occurring?
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Yesterday, 16:04 |
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#3 |
Member
Giovanni Bettega
Join Date: Sep 2014
Posts: 34
Rep Power: 12 |
Thank you,
I found a certain number of times this issue, because my results reader used (now not anymore) std::stringstream >> value (a double), so finding "nan" It generated an error. I had to introduce a parsing, for jumping over this issue,. So I can exactly recover the node number and its location. I will re-generate the case, and post mesh and .cfg. Thank you G Last edited by gbettega; Yesterday at 16:54. Reason: Typos |
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