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-   -   previous solution results as input (http://www.cfd-online.com/Forums/fluent/37810-previous-solution-results-input.html)

San September 6, 2005 19:22

previous solution results as input
 
I am solving steady state fluid flow and the velocities from the outlet face of one geometry are to be used as input velocities on the face of another geometry.

The mesh on the outlet face of one geometry is the same as the mesh on the inlet face of the other geometry.

The outlet velocities x,y,z were saved as boundary profile file in fluent (as write profile). These values were read (as read profile) into the second geometry.

After one iteration if the profile file from the second geometry is read, the values of the velocities dont match, although the coordinates were the same at that face of first and second geometry.

san


Ahmed September 6, 2005 21:25

Re: previous solution results as input
 
As far as I understand your description, it is not a boundary any more (df/dxi=0), now it is a part of the flow field and as such the initial profile is adjusted to the new geometry, hope that will help

zxaar September 6, 2005 21:34

Re: previous solution results as input
 
try exporting the velocity profile data and then compare, in fluent if you are comparing by plotting vector, you might no tget what you want. For example try plotting a vector plot for a wall , you will see finite vectors there , but in reality it should be zero vectors , for no slip. But when you export them and plot, you see they are zero vectors. The reason is the implementation of boundaries in fluent. So even if it is maintaining the profile you gave it, it may not be reflected on vector plots. (i might be wrong, since i have never checked this thing thoroughly)

san September 6, 2005 22:56

Re: previous solution results as input
 
hi,

I simulate a flow in a nozzle and get the velocities at the outlet of the nozzle (once its converged). I then place these velocities as input velocity for a mold.

The mesh and coordinates of the outlet face of the nozzle match with the mesh and coordinates of the inlet face of the mold. Yet, the values when written as "write profile" from the nozzle outlet and then read as "read profile" for mold case setup, dont match.

I opened both files in excel and saw the coordinates matching but not the velocities.

is there a better way of doing this ?

san


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