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Divergence problem in diesel nozzle internal flow simulation |
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#1 |
New Member
Changhao Lu
Join Date: Jun 2019
Posts: 12
Rep Power: 7 ![]() |
Hi everyone,
I am simulating cavitation in the diesel nozzle using Converge 3.0, and i am facing the divergence problem. The message is the following: (Rank 0) WARNING: [3467] Temperature extrapolation error found at cell 8304, located at (0.00158346, 0.000125, -0.000535289), in region 1, whose level=9 (Rank 0) WARNING: [3467] Temperature extrapolation error found at cell 8305, located at (0.00158346, 0.000125, -0.000485289), in region 1, whose level=9 (Rank 0) WARNING: [3467] Temperature extrapolation error found at cell 8308, located at (0.00159596, 0.0001625, -0.000547789), in region 1, whose level=10 (Rank 0) FATAL_ERROR: [ 366] Something is wrong in function get_temp_from_table_massfrac: upper_energy_value must be greater than lower_energy_value! upper_energy_value is -nan(ind), and lower_energy_value is -nan(ind). I have tried: -reducing the cell size -using first order upwind for solving equation -adjusting cfl number -adjusting initial pressure of the region but in vain, the simulation get stop soon in 0.02ms. Part of the log file has been uploaded. Hope to get some advice,thanks. |
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#2 | |
Member
Yanheng Li
Join Date: Jan 2016
Location: Convergent Science, Madison WI
Posts: 33
Rep Power: 10 ![]() |
Hi, Changhao,
Can you contact our support group to let someone here take a look?(support@convergecfd.com? Thanks. Quote:
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#3 |
New Member
Changhao Lu
Join Date: Jun 2019
Posts: 12
Rep Power: 7 ![]() |
Actually i have connected the support@convergecfd.com early this year, and tried to solve this problem with the advice got, but this problem still exists.
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#4 | |
Member
Yanheng Li
Join Date: Jan 2016
Location: Convergent Science, Madison WI
Posts: 33
Rep Power: 10 ![]() |
Hi, Changhao,
Can you post your inputs.in, solver.in, boundary.in, amr.in and vof.in here? I'll take a look whether there is anything obvious that can be improved. Quote:
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#5 |
New Member
Changhao Lu
Join Date: Jun 2019
Posts: 12
Rep Power: 7 ![]() |
Thanks so much!
I have packaged the files and uploaded. Very appreciate for your reply. |
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#6 |
Member
Yanheng Li
Join Date: Jan 2016
Location: Convergent Science, Madison WI
Posts: 33
Rep Power: 10 ![]() |
Try something like this revised version. These are just some general revision to make the run more stable. The actual stability performance may also depend on your actual physics and grids.
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#7 |
New Member
Changhao Lu
Join Date: Jun 2019
Posts: 12
Rep Power: 7 ![]() |
Very appreciate for your reply, I will try to continue with this adjust,and upload the problem and progress.
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Tags |
divergence problem, nozzle cavitation |
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