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STAR INTERNAL FLUID PROPERTIES ?

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Old   March 5, 2006, 07:21
Default STAR INTERNAL FLUID PROPERTIES ?
  #1
Wael
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Dear respected STAR-CD users, I am trying to use the STAR internally calculate properties. I got the error message " there is no sufficient dimensions for array for molecular viscosity, set NCMAXV=NCMAX and recompile". How to do that?. Your help is very much appericiated. Thanks in advance and my best regards. Wael
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Old   March 5, 2006, 17:38
Default Re: STAR INTERNAL FLUID PROPERTIES ?
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Jim
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I have no idea what you are trying to do, but something is wrong. Play around with your settings to find out what makes this error message occur, then contact support. As a general rule, STAR should not ask you to recompile having changed a variable. Therefore, either your set-up is wrong, or you've found a feature which may require enhancing.
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Old   March 5, 2006, 18:39
Default Re: STAR INTERNAL FLUID PROPERTIES ?
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TG
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You may possibly have changed something in prostar without writing out the correct files. Set up your problem, write out a geom file and a prob file. This should generate a correct parm.inc file (along with others) with the right settings. If you scan though the parm.inc file you should hopefully see a paramemter name NCMAXV and its setting should be the same number as NCMAX.
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Old   March 5, 2006, 20:18
Default Re: STAR INTERNAL FLUID PROPERTIES ?
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Wael
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Thanks alot Mr. Jim and Mr. TG, I had solved the same problem with constant properties first, then took the .mdl file and changed to use STAR internally calculated fluid properties. After writing the .gem and ,prob files and saving and starting STAR, I got the error mentioned. Now I changed the parameters in parm.inc and the case is working but the problem in K and epsilon (2L turbulence model), they do not converge as in the case of constant properties.!!! I think changing in parm.inc is not good thing but I have no other idea. My best regards. Wael
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Old   March 7, 2006, 08:18
Default Re: STAR INTERNAL FLUID PROPERTIES ?
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mg
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Hallo!

You should not need to edit parm.inc file. Prostar writes for you a parm.new file that you just have to rename in parm.inc. Anyway if the program runs, your parm.inc is probably correct. The convergence problems may arise because of the additional variability in viscoity. You may try to run a calculation using as initial field the solution with constant properties an reduce a little bit the relaxation factors.
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Old   March 7, 2006, 20:11
Default Re: STAR INTERNAL FLUID PROPERTIES ?
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Wael
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Thanks a lot, I will follow your steps and try using the constant properties case as a restart. Wael
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