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Velocity Profile as Boundary Condition

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Old   December 31, 2021, 12:03
Question Velocity Profile as Boundary Condition
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I am looking into whether or not it is possible to input a velocity profile (from a previous simulation) as a boundary condition in a new simulation. It seems that it may be possible to do this in Converge, but I am not quite sure how to yet.

More specifically, what I am trying to do is to run a pipe-flow simulation, and then I would like to take the velocity profile (and other conditions like temperature) and use them as boundary conditions in a subsequent simulation. From what I can gather, Converge does write the velocity profile upon completion on a simulation, but I am not sure if or how to then use it as a boundary condition.
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Old   December 31, 2021, 19:29
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Yu Zhang
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Hi,

CONVERGE writes map files at the end of each simulation, including the map_< time >.h5 file for the volume and the map_ bound <boundary ID>_ <time> .out files for simulations with the "INFLOW" or "OUTFLOW"
boundaries. These map_ bound <boundary ID>_ <time> .out files contain the coordinates, velocity components, pressure, temperature, and other quantities on the inflow and outflow boundaries. Since they are column formatted ASCII files, you can easily manipulate the file contents and change the file extension from ".out" to ".in", then you can import/use the ".in" file as the boundary condition (inlet and outlet) profile file.

On the other hand, it is easy to assign a profile to a certain boundary condition in CONVERGE. In Studio, you just need to click the "Use profile" box for the desired boundary condition, then a follow-up window will pop up, and you can specify the profile (including importing from the existing file) there. Please go to "https://hub.convergecfd.com" and refer to training material related to the boundary conditions for the detailed guide.

Please contact your local CONVERGE support team if you need any further assistance from us.

__________________________________________________ ______
Yu Zhang, Ph.D.
Research Engineer - Applications
CONVERGECFD
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