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January 24, 2017, 06:12 |
Error real gas correction
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#1 |
New Member
Join Date: Oct 2016
Posts: 15
Rep Power: 9 |
Hi guys,
when I try to start my simulation, I receive following error: "Error calculation of rmw in function real_gas_correction: rmw is 0.000000". I activated real_gas_prop_flag and set the maximum reduced pressure to 6.0. If I deactivate this option and set the real gas properties only as a function of temperature, the error will not appear. I already searched in the CONVERGE manual and the CONVERGE theory manual for a solution, but could not find any information about the parameter real_gas_correction or the meaning of rmw. It would be very helpful if anyone can tell me the meaning of that parameter and how to modify it. Thanks in advance. Best regards |
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January 24, 2017, 10:15 |
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#2 |
Member
Jerome Le Moine
Join Date: Jan 2016
Location: Convergent Science, Madison WI
Posts: 50
Rep Power: 10 |
GNKK,
rmw is the reciprocal molecular weight, as an example you can use rmw to calculate the specific gas constant as Ru= universal gas constant*rmw For some reason, in your case the rmw is calculated as zero. What type of simulation are you running? |
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January 24, 2017, 21:47 |
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#3 |
New Member
Join Date: Oct 2016
Posts: 15
Rep Power: 9 |
Hey Jerome,
I am simulating the internal flow of a nozzle. I use VOF and RANS models. I use the Redlich-Kwong-Soave equation and species dependent critical conditions. What other information do you need? Edit: For the initial species inside the nozzle I used only air ( 0.23 O2 & 0.77 N2) and for the inlet boundary I used only C7H16 for the species boundary condition. I changed the species boundary condition now and added a small mass fraction of O2 and N2 (1e-7) and the error does not appear now. Can you explain why? Is it because I use the VOF model and we need some nucleus inside the liquid to develop cavitation? Best regards Last edited by anon_p; January 26, 2017 at 02:38. |
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January 26, 2017, 17:03 |
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#4 |
Member
Jerome Le Moine
Join Date: Jan 2016
Location: Convergent Science, Madison WI
Posts: 50
Rep Power: 10 |
Whatt version of Converge are you using for this study?
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January 27, 2017, 00:54 |
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#5 |
New Member
Join Date: Oct 2016
Posts: 15
Rep Power: 9 |
Hi,
I am using version 2.2.0. |
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January 31, 2017, 10:34 |
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#6 |
Member
Jerome Le Moine
Join Date: Jan 2016
Location: Convergent Science, Madison WI
Posts: 50
Rep Power: 10 |
It seems it could be an error from the code, V2.2 is frozen at this point. Any bug fixes will be added to V2.3. I would recommend using the latest V2.3 to see if your simulation goes through. If you are still having issues please send your input files to support@convergecfd.com. Thank you,
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