How to extract results from a previous simulation and use them as BCs?
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Question: Fluent simulation of a system of components was performed. How do I extract the results on certain interior zones and apply them as BCs for the subsequent analysis of an individual component? Mesh size of the 2 CFD problems is different-is that an issue? Answer: Use "Profiles" feature in fluent. No problem if the meshes are different (fluent will automatically interpolate). As an illustration of the above problem, see attached images "all.gif"and "single.gif": "all.gif" (see <a target=_blank href="http://www.fluentusers.com/support/solutions/929/all.gif">http://www.fluentusers.com/support/solutions/929/all.gif</a>http://www.fluentusers.com/support/solutions/929/all.gif ) shows 3 pipes (~ a system), "single.gif" (see <a target=_blank href="http://www.fluentusers.com/support/solutions/929/single.gif">http://www.fluentusers.com/support/solutions/929/single.gif</a>http://www.fluentusers.com/support/solutions/929/single.gif ) shows a single pipe in the middle (~ a component); It is desired to extract solution at zone A from the 3-pipe-system analysis and apply those values as BCs for the analysis of the pipe-2 only. Step-by-Step Method: 1. read the "all system" case & data file into Fluent 2. select File>Write>Profile...>Define New Profiles; select desired zone(s) under Surfaces: for example, zone "A"; select desired field variables under Values: for example, velocity magnitude. click on Write, specify a name for the .prof file. 3. read "single component" case & data file into Fluent 4. select File>Read>Profile... select the desired .prof file 5. apply the profile as boundary condition: for example, click on Define>BC select zone A, click on Set, under Velocity Magnitude select velocity-magnitude profile 6. initialize, and iterate as usual. Attached "all-A_velocity.gif" (see <a target=_blank href="http://www.fluentusers.com/support/solutions/929/all-A_velocity.gif">http://www.fluentusers.com/support/solutions/929/all-A_velocity.gif</a>http://www.fluentusers.com/support/solutions/929/all-A_velocity.gif ) and "single-A_velocity.gif" (see <a target=_blank href="http://www.fluentusers.com/support/solutions/929/single-A_velocity.gif">http://www.fluentusers.com/support/solutions/929/single-A_velocity.gif</a>http://www.fluentusers.com/support/solutions/929/single-A_velocity.gif ) illustrate that the Profile feature is grid independent. For additional information consult Fluent documentation 6.26 on Profiles, and 3.14 on Grid Interpolation. |
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