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March 5, 2012, 11:00 |
Dimension Error
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#1 |
Senior Member
Goutam Saha
Join Date: Dec 2011
Location: UK
Posts: 131
Rep Power: 14 |
Dear Friends
I have calculated wall Heat Flux using wallHeatFlux command in terminal. When I run this for a laminar case, it works properly. But when I run this for Turbulent case: kEpsilon model then I got the following error massage: Different dimensions for dimensions: [ 1 -1 -1 0 0 0 0 ] = [ 0 2 -1 0 0 0 0 ] My question is, if Its a dimesional error then how I got the correct result for laminar case? I am really confused !!!!!!!!!!!!!! |
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March 5, 2012, 11:20 |
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#2 |
Member
Rob
Join Date: Sep 2011
Posts: 55
Rep Power: 14 |
Seems like the second entry is the first one divided by the density.
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March 5, 2012, 11:29 |
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#3 | |
Senior Member
Goutam Saha
Join Date: Dec 2011
Location: UK
Posts: 131
Rep Power: 14 |
Quote:
Is there anyone who uses wallHeatFlux command to calculate heat flux at the wall for turbulent case? Thanks ... |
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March 6, 2012, 06:56 |
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#4 |
Senior Member
Goutam Saha
Join Date: Dec 2011
Location: UK
Posts: 131
Rep Power: 14 |
I am using buoyantBossinesqSimpleFoam and run the wallHeatFlux command for kEpsilon model. I got Dimension Error. Its created 3 new file, one is k.old, epsilon.old and mut in the 0 folder. When I use this for laminar case, there is no error.
Can you help me? |
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March 6, 2012, 07:16 |
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#5 | |
Senior Member
mauricio
Join Date: Jun 2011
Posts: 172
Rep Power: 17 |
Quote:
Also you could trick the app if your density is on avg 1, just assign the dimensions you need on the specified dictionaries (variable's files) where this errors occurs!
__________________
Best Regards /calim "Elune will grant us the strength" |
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March 6, 2012, 07:44 |
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#6 | |
Senior Member
Goutam Saha
Join Date: Dec 2011
Location: UK
Posts: 131
Rep Power: 14 |
Quote:
Previously, I run this for BuoyantBossinesqSimpleFoam laminar incompressible case and then I have calculated the Nusselt Number. It works fine. Since in RAS properties, I switch off turbulent, I didn't get any error. Now I am solving the same problem for turbulence case with higher Ra values. Another thing, for BuoyantBossinesqSimpleFoam, do I have option to enter the value of rho. In transport properties, I have entered the values for nu, beta, Tref, Pr, Prt. Thanks |
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March 6, 2012, 08:16 |
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#7 | |
Senior Member
mauricio
Join Date: Jun 2011
Posts: 172
Rep Power: 17 |
Quote:
maybe it's an application issue, turning on turbulence should not change the postprocessing app's behaviour since ur not changing the physics of the case... i guess the appl only postprocess results. maybe the nusselt application already accounts for both physics, hence dimensions, whereas wallheatflux seems not! check that Code:
Another thing, for BuoyantBossinesqSimpleFoam, do I have option to enter the value of rho. In transport properties, I have entered the values for nu, beta, Tref, Pr, Prt.
__________________
Best Regards /calim "Elune will grant us the strength" |
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December 18, 2012, 17:53 |
Possible solution...
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#8 |
New Member
V. L. Scalon
Join Date: Dec 2012
Posts: 1
Rep Power: 0 |
I'm having the same problem. I can solve it putting the thermophysicalproperties file on constant directory. It isn't used by buoyantBoussinesqPimpleFoam, but wallHeatFlux uses it....
You can try, but don't delete tranportProperties. The my thermophysicalProperties is: Code:
thermoType hRhoThermo<pureMixture<constTransport<specieThermo<hConstThermo<perfectGas>>>>>; pRef 100000; mixture { specie { nMoles 1; molWeight 28.9; } thermodynamics { Cp 1000; Hf 0; } transport { mu 1.8e-05; Pr 0.7; } } |
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