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 July 5, 2004, 04:58 Re: Boundary threads problem #2 kethireddy Guest   Posts: n/a Hello I want to learn the basic of controlling the faces and cell threads for my udf's (especially boundries). Please help me in this area. kethireddy

 July 5, 2004, 05:30 Re: Boundary threads problem #3 Andrew Garrard Guest   Posts: n/a The best place to start is to read the UDF manual that comes with Fluent 6.

 July 5, 2004, 06:03 Re: Boundary threads problem #4 kethireddy Guest   Posts: n/a Hi Andrew Garrard, thasnks for reply.Infact i have studied the manual but there is something lacking in it. U please see the next thread in which u know my actual situation. Please see it..! I hope u can definately help out thanks a lot kethireddy

 July 5, 2004, 10:08 Re: Boundary threads problem #5 Andrew Garrard Guest   Posts: n/a I appologise if this seem like an obvious comment,but have you turned on the UDS in fluent using Define -> User defined -> Scalers... Appart from that, have you tried running the UDF as it gives in the example 4.3.12: where the denominator can be determined by averaging the adjacent cell's density values C_R(F_C0(f,t),F_C0_THREAD(f,t)) and C_R(F_C1(f,t),F_C1_THREAD(f,t)).

 July 5, 2004, 12:03 Re: Boundary threads problem #6 kethireddy Guest   Posts: n/a Hi thanks for ur double quick reply. i am trying to solve a transport equation using user defined scalar.In this equation i want to customorise the differential transport equation by using userdefined function so that fluent always calculates for uds instead of flux. AS YOU SAID I TRIED earlier TO DO AVERAGING ALSO ,UNFORTUNATELY there is some segmentation error. So to make life simplere i used simple function and i have taken the F_R(f,t) , which can never be out of range of memory which is responsible for segmentation error. if i take rho as constant fluent program is giving results as expected. please try to explain me exactly about checking the boundry thread and also accesing next faces in x dir and y direction. see u bye kethireddy

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