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How to make UDF for the spatial variation of viscosity? |
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September 12, 2019, 13:46 |
How to make UDF for the spatial variation of viscosity?
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New Member
Nitesh Dubey
Join Date: Jun 2018
Posts: 4
Rep Power: 7 |
Hi,
Need a small help. I am looking for a UDF for the spatial variation of viscosity. Viscosity is varying in two directions (say X and Z). I tried but when I am loading in the fluent. Simulation showing floating point exception error. /************************************************** ******************* UDF that simulates spatially dependent viscosity property ************************************************** ********************/ #include "udf.h" #define a 20105467790.5412 #define b 2.692576799425 #define c 5083.56137738767 #define d -84995.6051593393 #define e -2230225.26461472 #define f 852890049.062181 #define g 502636694.742164 DEFINE_PROPERTY(cell_viscosity, cell,thread) { real mu; real y, z; real ZB[ND_ND]; C_CENTROID(ZB,cell,thread); y=ZB[1]; /* y cooridnate*/ z=ZB[2]; /* z cooridnate*/ mu=1.21 - 2.71*(a + b*(z-0.006) + c*pow(z-0.006,2.) + d*pow(z-0.006,3.) + e*pow(z-0.006,4.) + f*pow(z-0.006,5.) + g/(y+0.52347)) + 25.46*pow((a + b*(z-0.006) + c*pow(z-0.006,2.) + d*pow(z-0.006,3.) + e*pow(z-0.006,4.) + f*pow(z-0.006,5.) + g/(y+0.52347)),2.); return mu; } Is there any problem in this UDF? |
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