# UDF for a 2d vaned diffuser inflow velocity

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 September 5, 2013, 12:58 UDF for a 2d vaned diffuser inflow velocity #1 New Member   SIVAKUMAR Join Date: Jul 2013 Location: coimbatore Posts: 13 Rep Power: 4 hi guys..am new to cfd-online... myself shiva...doing Mtech project in vaned diffuser analysis in fluent...i need a UDF for vaned diffusser....it is in polar co-ordinates. x component velocity is 329.39*cos(tan^-1(y/x)-71.56) y component velocity is 329.39*sin(tan^-1(y/x)-71.56) can u guide me to create a UDF please theta (y/x) is changing with respect to center of the inner circle can i import a two UDF for a velocity...plz guide me guys...Snapshot9.jpg please help me guys.....urgent....!!!..plzzz my mail id = contactshiva@ymail.com

 September 20, 2013, 00:01 #2 New Member   SIVAKUMAR Join Date: Jul 2013 Location: coimbatore Posts: 13 Rep Power: 4 i created a UDF for my problem but my contour is not matching...is this udf correct or not..please help me out...!!! #include "udf.h" DEFINE_PROFILE(inlet_x_velocity, thread, position) { real x[ND_ND]; real xcord; real ycord; face_t f; begin_f_loop(f, thread) { F_CENTROID(x,f,thread); xcord=x[0]; ycord=x[1]; F_PROFILE(f, thread, position) =(375.510*cos(atan(ycord/xcord)-71.56)); F_PROFILE(f, thread, position) =(375.510*cos(atan(ycord/xcord)-71.56)); } end_f_loop(f, thread) }

 September 20, 2013, 00:02 #3 New Member   SIVAKUMAR Join Date: Jul 2013 Location: coimbatore Posts: 13 Rep Power: 4 am using density based solver..inviscid flow....please guys am waiting for ur reply

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