data extaction of boundary layer thickness

kick · December 9, 2013, 11:16

Hi

I would like to validate my results of flow over a flat plate with blasius solution.
I run the case in simplefoam and i could see my results in parafoam.
However i would like to compare the boundary layer thickness with blasius solution along the flat plate, but unsuccessful in extracting the data from the results i got.

I am trying to extract the data from parafoam is that possible, i also tried using sampledict file but it shows nothing.

How can i extract the data from the results i got.

Please help me with your suggestions.

Thank You
Karthik Goli

bgraves · December 16, 2013, 16:40

Hi Karthik,

A few suggestions:

1. Blasius' solution is for laminar flat plate flow, if you are using simpleFoam, which is a turbulent solver, make sure in the RASProperties file you have laminar selected as the "turbulence model" and turbulence turned off. I recommend using icoFOAM if you are solving a laminar problem.

2. In ParaFOAM you can get the data by using the filters>data analysis>plot over line. Once you have generated the graph then go to file> save data.

3. The sample file is probably empty because you are specifying data points outside your domain.

Hope this helps,
-Ben

December 9, 2013, 11:16	data extaction of boundary layer thickness	#1
kick New Member Karthik Goli Join Date: Nov 2013 Posts: 7 Rep Power: 12	Hi I would like to validate my results of flow over a flat plate with blasius solution. I run the case in simplefoam and i could see my results in parafoam. However i would like to compare the boundary layer thickness with blasius solution along the flat plate, but unsuccessful in extracting the data from the results i got. I am trying to extract the data from parafoam is that possible, i also tried using sampledict file but it shows nothing. How can i extract the data from the results i got. Please help me with your suggestions. Thank You Karthik Goli

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December 16, 2013, 16:40		#2
bgraves New Member Ben Graves Join Date: Dec 2012 Posts: 18 Rep Power: 13	Hi Karthik, A few suggestions: 1. Blasius' solution is for laminar flat plate flow, if you are using simpleFoam, which is a turbulent solver, make sure in the RASProperties file you have laminar selected as the "turbulence model" and turbulence turned off. I recommend using icoFOAM if you are solving a laminar problem. 2. In ParaFOAM you can get the data by using the filters>data analysis>plot over line. Once you have generated the graph then go to file> save data. 3. The sample file is probably empty because you are specifying data points outside your domain. Hope this helps, -Ben