CFD Online Discussion Forums

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-   -   Patch (http://www.cfd-online.com/Forums/fluent/28039-patch.html)

Eric November 21, 2000 09:12

Patch
 
Hi, I am using the VOF model to simulate two phases flow in my project. I face some problems in patch function? Actually, what is the function of patch? I welcome the responses from all of you. Thank You!

Trac November 24, 2000 00:23

Re: Patch
 
Use Patch after you've initialized to fill areas of your domain. So you can then start the solution with one part filled with water and another part filled with air, rather than having to wait for them to "fill up". It's quicker and more stable.

Eric November 27, 2000 10:23

Re: Patch
 
What are the values i need to patch? How about the values of velocity of x-axis, y-axis, z-axis and etc which appear in the command box?

Marco November 27, 2000 12:50

Re: Patch
 
With patch you are able to give an initial guess to your solution. Imagine a flow through an elbow (90 deg.) It wouldnt be reasonable to initialize the whole flow field with one initial guess for exaple in the x direction. Because after the elbow the mainflow direction is y so you can patch diffrent zones with diffrent velocities (temperature etc.)

Eric November 30, 2000 23:37

Re: Patch
 
Dear Marco,

I am not sure about what you mentioned. Let say in the case of 90 degree elbow, the flow is from -x axis to z axis. So how I going to define the patch value for the x, y, z velocity? Can you please explain it in detail? Thank you.

Marco December 1, 2000 11:14

Re: Patch
 
With Adapt Region you can create a so called register, just mark the zone you want to patch a velocity to.

Then you can patch a value under ->initialize->patch in teh fluent menu



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