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December 22, 2000, 05:22 |
Blockage in CFD code
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#1 |
Guest
Posts: n/a
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Hi,
I am currently playing with the CFD code in that comes with the book by Peric and Ferziger. I would very much like to implement a method for setting blockage internally in the domain. Can any one give me a hint on how to do this ? What is the best way ? Thanks in advance. Regards Roued |
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December 23, 2000, 04:31 |
Re: Blockage in CFD code
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#2 |
Guest
Posts: n/a
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hi Roued,
I am not sure how the code u are referring to is written. but the general way is (Patankar's funda). for any grid point u write the equation as Ap_phi_p = Sigma A_i Phi_i +Su Where Ap= Sigma A_i+Sp Phi is a general variable (u,v,w,t,p,k,e ....) Make Sp very large (say 1e25) and similarly Su= 1e25 (must be equal to value of Sp) for the grid point for which u want to freeze the value. U can initialise the value required and it will remain unchanged throuthout the iterations. if u put Phi_p =0 for u,v,w u will create islands in the flow path. Specify these values for all the grid-points that u want to freeze. Note: for equations having large value of variables this may blow up due to overflow (typically k-e) Some care is required in grid spacing at blocked areas. Hope this helps Abhijit Tilak. |
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