# new propety

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 December 9, 2013, 08:01 new propety #1 Member   shahrbanoo Join Date: Mar 2013 Posts: 58 Rep Power: 4 Hi dears... I had a code for defining new viscousity for blood, but when I interpret it, it says: C:\Users\NoneStop\Desktop\viscous.c: line 18: function returning double returns float. the code is here: # include "udf.h" # define n 0.67 # define alpha 1.0 # define muo 0.0042 DEFINE_PROPERTY(Power_law_model,cell,thread) { float visc,trace; float u[3],v[3],w[3]; int i; for(i=0; i<3; i++) { u[i] = C_U_G(cell,thread)[i]; v[i] = C_V_G(cell,thread)[i]; w[i] = C_W_G(cell,thread)[i]; } trace = 0.5*(2*pow(u[0],2) + pow(v[0]+u[1],2) + 2*pow(v[1],2) + pow(v[2]+w[1],2) + 2*pow(w[2],2) + pow(w[0]+u[2],2)); visc = 0.5*muo*pow(1+alpha*trace,0.67); return visc; } what should I do? please help me...

 December 9, 2013, 09:06 #2 Senior Member   Join Date: Nov 2013 Posts: 689 Rep Power: 9 You don't have to worry about this. You are running Fluent in double precision, but the udf you wrote returns a value in single precision. The interpreter gives a warning about this, but for viscosity it is no problem to use single precision. If you want to get rid of this warning, you can: - Run Fluent in single precision (probably not preferred) - Change the variable "visc" to a double (define it as "double visc" instead of "float visc". - Explicitly cast the result into a double: change "return visc;" into "return (double)visc;" disclaimer: I did not test these options, my syntax may be slightly wrong. But you can also choose to ignore the warning. shahrbanoo likes this.

 December 9, 2013, 12:57 #3 Member   shahrbanoo Join Date: Mar 2013 Posts: 58 Rep Power: 4 thank u so much Mr PaKK The error went away!!

 December 10, 2013, 03:55 #4 Member   shahrbanoo Join Date: Mar 2013 Posts: 58 Rep Power: 4 Hi I want to run my case but when I initialize it, says: Error: FLUENT received fatal signal (ACCESS_VIOLATION) 1. Note exact events leading to error. 2. Save case/data under new name. 3. Exit program and restart to continue. 4. Report error to your distributor. Error Object: () why is this error for? regards

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