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-   -   problem with velocity inlet profile file (http://www.cfd-online.com/Forums/fluent/38654-problem-velocity-inlet-profile-file.html)

Duncan November 17, 2005 10:01

problem with velocity inlet profile file
 
Hello,

I am using Fluent 6.20.1 with Exceed.

I have written a velocity inlet profile file and am trying to import this and use as a velocity input for my 3d volume. I can see the profile under the Define-->Profiles-->menu and can set the velocity input boundary conditions so that the x-velocity is that from the profile file. However when i go to Initialize... an error message arises saying Interpolate_profile_field:thread 5:profile 'velocity-inlet' does not exist. I have gone through and can still see it in the define profiles menu although if i try and delete the profile i get another error message claiming Delete_Profile: Not in list.

Does anyone know what I am doing wrong and why these error messages are arising? I have done searches on this forum but these have been unsuccessful.

Any advice will be gratefully received. Many thanks,

Duncan

RoM November 17, 2005 11:06

Re: problem with velocity inlet profile file
 
Maybe your profile file has a wrong format. To create a template for the profile set the velocity inlet of your domain to constant value and export the resulting profile (File->write profile). You can adjust the values in that file with a text editor and then read it back.

Hope it helps, RoM

Duncan November 21, 2005 07:54

Re: problem with velocity inlet profile file
 
Hi, I used your advice and changed my delimiter from tabs to spaces (The manual says you can use any mixture of either?!) and managed to get my velocity input data into Fluent. Many Thanks.

However, I am a little confused how to set the velocity inlet data as when i go to define boundary condition and select the appropriate velocity input values from the drop down list, there is no location to put in the co-ordinate data. Does Fluent read this automatically? If so, what could be the reasons for getting an inlet profile with a constant velocity value when there are a number of different velocity values?

Any advice would be gratefully received.

Duncan

RoM November 21, 2005 08:28

Re: problem with velocity inlet profile file
 
Fluent will store vx, vy and vz for each facet of your boundary. Your profile file gives information about the coordiantes (x,y,z) and the values of vx,vy and vz at the facet center. If fluent does not find the x,y and z coordinates for a facet center it will interpolate from the closest values in your file. All you will have to do in the velocity inlet panel is to set "velocity specification method" to "components" and change the values for vx,vy, vz from "constant" to the components from your profile file. Fluent should take care of the exact position.

RoM


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