is there kind of wall function like this!

burt · December 5, 2012, 06:39

hi there,
I have been engaging in openfoam study. Obviously I am not that good at it and meet lots of problems, whatsoever, I will keep learning. i am wondering if anyone can tell me whether there is some wall functons can offer 0 shear stress along the wall.
I am trying to simulate axis revolution body moving in water,

as you can see in my picture, turblent wall function,whick is not supposed, is applied on the cylinder bound( I name it HULL), currently I define it as below

HULL
nuTilda type zeroGradient;
P type zeroGradient;
nut type slip;
value uniform 0;
U type slip;
k type slip;
epsilon type slip.
RAS model k-epsilon pisoFoam/simpleFoam are adopted...
2012-12-05 19_16_46?????.jpg
any advice is appresiated.

mgdenno · December 5, 2012, 12:43

I am not sure that I fully understand what you are trying to accomplish, but I think that maybe the problem you are having is just a visualization problem caused by the interpolation of the data in paraFoam. I am not in front of my CFD machine at the moment but in paraFoam where you choose the variable to visualize there are two choices for each variable one is interpolated and the other isn't. I would try the non-interpolated one and see if it looks like you would expect.

burt · December 7, 2012, 01:27

thanks mgdenno
and sorry for my poor english

I will take a try
and I think the problem can be solved in your way...

thanks again...

December 5, 2012, 06:39	is there kind of wall function like this!	#1
burt New Member Join Date: Dec 2012 Posts: 9 Rep Power: 13	hi there, I have been engaging in openfoam study. Obviously I am not that good at it and meet lots of problems, whatsoever, I will keep learning. i am wondering if anyone can tell me whether there is some wall functons can offer 0 shear stress along the wall. I am trying to simulate axis revolution body moving in water, as you can see in my picture, turblent wall function,whick is not supposed, is applied on the cylinder bound( I name it HULL), currently I define it as below HULL nuTilda type zeroGradient; P type zeroGradient; nut type slip; value uniform 0; U type slip; k type slip; epsilon type slip. RAS model k-epsilon pisoFoam/simpleFoam are adopted... 2012-12-05 19_16_46?????.jpg any advice is appresiated.

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December 5, 2012, 12:43		#2
mgdenno Senior Member Matthew Denno Join Date: Feb 2010 Posts: 138 Rep Power: 16	I am not sure that I fully understand what you are trying to accomplish, but I think that maybe the problem you are having is just a visualization problem caused by the interpolation of the data in paraFoam. I am not in front of my CFD machine at the moment but in paraFoam where you choose the variable to visualize there are two choices for each variable one is interpolated and the other isn't. I would try the non-interpolated one and see if it looks like you would expect.

December 7, 2012, 01:27		#3
burt New Member Join Date: Dec 2012 Posts: 9 Rep Power: 13	thanks mgdenno and sorry for my poor english I will take a try and I think the problem can be solved in your way... thanks again...