# Making boundary profile on a surface in xz- plane

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 May 3, 2002, 05:01 Making boundary profile on a surface in xz- plane #1 varghese Guest   Posts: n/a Hai Friends, I have to make a boundary profile for a surface lying in xz-plane on a 3D geometry. I encountetr the following problem in doing so: In order to define a point, line or mesh profile, one has to define x,y fields necessarily, along with the different variable fields as required. The z-field is reserved for definition of the profiles in 3 dimensions. In the current problem, I rather have to make a profile for a surface lying in the x-z plane. Can I change the default dimension definitions in Fluent? Or is there any other way to solve the problem? I have some data available from experiments for the boundary values, from which I want to generate a complete boundary profile for the surface in xz-plane. I want to be helped in this problem. Greetings, Varghese

 May 3, 2002, 05:45 Boundary Profile/Plane #2 Alex Guest   Posts: n/a Hi Varghese, you surely know that y profile looks like (my_prof point 3) (x 1 2 3) (y 1 1 1) (z 1 2 3) (my_var 4 5 6) ) or something like that. From what I got you 1) are working in 3D 2) want to set a BC as profile on a XZ plane 3) want to use experiment data I'll suggest to 1) create a file my_profile.prof with the following content (my_profile_name point nbx_of_point) (x in line or colum put all the x coordinates) (y '' '' '' '' y coordinates, they should be all constant since you are working in XZ) (z '' '' '' '' z coordinates, make sure that they corresond to the x coordinates) (my_var '' '' '' my_var values) ) read the profile with FILE/READ-PROFILE>. Profile is interpolated automatically by FLUENT. Export a TECPLOT file from your boundary to see if it worked properly or not( do not try contour it's crap!!!). Shuss, Alex

 May 3, 2002, 07:14 Re: Boundary Profile/Plane #3 varghese Guest   Posts: n/a Dear Alex, Thank you for responding to my request. I think, I must clarify the problem little more, to make the issues involved little more clear. I have experimental data not over the face, but rather on two edges defining that face, in xz plane. My intention is therefore first to create a profile for the face, independently of the 3D geometry. And use that, as the boundary condition on the face in xz-plane, in the 3D problem. i.e., I have to create a 2D face-profile from a line profile, to be used as boundary condition for a 3D problem. It is the realization of the first step, which is invariably related to the final step that poses the problem. In other words, that I have to generate a profile on a face in xz plane, which is a part of a 3D geometry, from the data points on the edges of that surface, proves to be a difficult programme for me. How to get around it? Thank you for the further suggestions, Varghese

 May 3, 2002, 07:36 1D to 2D? #4 Alex Guest   Posts: n/a Hi V, yep sorry for the misunderstanding... I should read it more carefully. so is the following closer to your issue. 1)you have a face(boundary) onwhich you want to apply a profile 2) you only have the value on 2 edge of the face 3) you want to create a profile from the info of those 2 edges OK sounds like an interpolation to me. If the edges are parallel I would suggest to do a linear interpolation Edge 1 --> | x | <--Edge 2 total lengt= L my_val(x)=x*(my_val(edge1)-myval(edge2))/L + my_val(edge1) and this for a constant z If they are orthogonal... Edge 1 --> | (x,y) _ <-- Edge2 my_val(x,y)=my_val(x , y=0 i.e. on edge2)+ y (my_val(x=0 i.e. on edge1,y)-my_val(x=0 i.e. on edge1, y=0 intersection) Ok it's confusing but I'm sure that a drawing would ease it all. Did I get the problem this time? Alex

 May 3, 2002, 08:01 Re: 1D to 2D? #5 varghese Guest   Posts: n/a Dear Alex, Yes, I understand my problem exactly; thank you for that. But now, I fail to understand your answer! I get the idea that I must do some interpolation from one edge to the other. But which part of Fluent will help me to implement interpolation. I have never used that facility. Thank you for this new information. I am waiting for your reply, varghese

 May 3, 2002, 08:21 Fortran or C++ or EXEL #6 Alex Guest   Posts: n/a Hi Varghese, Why not using one of those software for your interpolation? I doubt that FLUENT can handle it properly. For my breif explanation, I fairly understand that it's not easy to understand it... Main idea is to try to use the information you have to fill the grid. After you can even use a spline if you want. Problem being I don't really klnow how to make my previous reply clearer. Sorry, Alex

 May 3, 2002, 08:38 Thank you! #7 varghese Guest   Posts: n/a Dear Alex, Thank you very much. I understood the idea behind your answer but doubted that there exists some functionality which I have never explored. Don`t be sorry for your answer, it is crystal clear. Problem was that I expected something inside Fluent. Be happy and enjoy life!! Varghese

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