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Old   January 24, 2005, 14:23
Default fine grid volume
  #1
timur
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Hello. Sorry my english. I try to use Fine Grid object in my calculation (in block regions). But earth send message (in result file): solvfg is in use for indvar= 149 lb index= 642510

nphi4 = 600

block-location index too big in gcslwl

execution aborted

error stop How can I find out the solution of this problem? Can anybody help me? Thanks in advance.
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Old   February 3, 2005, 12:50
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  #2
Mick Hughes
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I'm not sure what the problem is ! I wonder if you can simplify your problem. Try using a Null object instead of a Fine grid volume and refining the mesh density in the Null object region. Does the problem go away?

Try toggling various options to try and hone in on "the cause" . For Example if youre turb model uses LTLS try standard KE or running laminar.

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Old   February 3, 2005, 17:52
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timur
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Thank's for reply, Mike. I'm trying to use standart KE model and it variants but I couldn't obtain the convergence with FG. In the end I putting down the FG and refine grid without it.
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Old   February 4, 2005, 08:37
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Mick Hughes
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Wise decision
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Old   February 4, 2005, 16:20
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  #5
timur
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Thanks. Mike, can I ask you 1 question? In more of my problems FG (think not in my) doesn't work but very desirable. Can I hope that in Phoenics x.xx version FG will be work good (or almost good)? If ansver - yes, can I tell you - when? Thank you in advance.
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Old   February 8, 2005, 08:03
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Mick Hughes
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Yes, I'm not sure Timur, I think its pencilled in the pipe line for some work in the future, however I know that there are lots of other pressing matters with higher priority and limited resourses, so I am sorry I can not give you a straight answer.

One of the major problems with looking at FGV cases is that it is hard to find a simple case that is clearly wrong. With many cases some slight changing of conditions or reducing mesh density can cause the case to run or the results to seem realistic, so debugging is a problem.

If you have such a simple case it could be useful.

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Old   April 3, 2005, 14:45
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  #7
PattiMichelle
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Yes, I've noted problems when introducing a FGE - usually you have to relax things much more. Pressure mostly. Also, try turning on Automatic Convergence Control.
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Old   April 3, 2005, 14:47
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  #8
PattiMichelle
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I've also used nonuniform grids, with the fineness adjusted so that the fine regions coincide near objects that need grid refinement - that sometimes precludes the need for FineGridVolumes. You can make null objects which affect the grid to make the locations for your nonuniform grids.
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Old   April 4, 2005, 02:50
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  #9
timur
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Thank you Patti. Now I trying to use Null obj for grid refining. What about FGO and relaxation (and SARAH) of pressure etc - it does not helps me.
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Old   April 4, 2005, 15:04
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  #10
PattiMichelle
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I have trouble with FineGrids sometimes and SARAH isn't terribly helpful. If you have version 3.6 there is an Automatic Convergence Control which seems to be very helpful in many cases. You just have to start adding relaxation, especially of pressures and densities (especially for gases).
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Old   April 5, 2005, 04:50
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  #11
timur
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I have v. 3.6 with limitation of f-array 3 000 000 elements (32 Mb RAM). And I have v.3.5 without any limitation. So more of my problems I solve with v. 3.5 (unfortunately)
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Old   April 7, 2005, 15:03
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  #12
Patti Sheaffer
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Get More RAM
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Old   April 8, 2005, 02:35
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  #13
timur
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No, I have limitation version 3.6 (no more than 32 MB). My computer has 512 MB RAM.
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Old   April 8, 2005, 03:14
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  #14
Kevin Chow
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I'm just guessing here, but have you looked in one of the .ini files (Phoenics.ini?) - there might be a flag that you can change to increase the memory allocation space.
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Old   April 8, 2005, 06:12
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  #15
timur
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I bought ver 3.6 with limitations: Number of elements of f-array in my ver. Phoenics 3.6 - 3 000 000. That means I can't use more then 32 MB RAM. If I want to use more than 3 000 000 elements of f-array I have to recompile Earth, but my ver. non recompilible... And what is more - in systemdisc/phoenics/d_earth locations 1 file earth.exe (no earth.64, earth.256, earth.512 ...).
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Old   May 3, 2005, 13:09
Default Re: fine grid volume (Hi CHAM!)
  #16
PattiMichelle
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Maybe CHAM would like to pipe in here??
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Old   August 21, 2005, 05:23
Default Re: fine grid volume (Hi CHAM!)
  #17
mick
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I think kevin had a good idea. with V3.6 (PC) you could try and increase the EARTh size in the file \phoenics\d_allpro\cham.ini

Try experimentally increasing this timur.

[F-array] Satellite = 2000000 Earth = 10000000 <----- Photon = 100000 Pinto = 100000
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Old   August 22, 2005, 13:56
Default Re: fine grid volume (Hi CHAM!)
  #18
Patti Sheaffer
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I wanted to mention that I had a problem with memory in 3.6. I received an error message from EARTH telling me I might want to increase swapfile size (however it's already at Win2000's max, 4 GIG) or else, as Mick suggested, the allocation in cham.ini. But this didn't work. I'm wondering if perhaps it didn't work because I only increased EARTH's allocation? i.e., [F-array] Satellite = 2000000 Earth = 200000000 Photon = 100000 Pinto = 100000

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