# Help With If statement

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 June 11, 2014, 09:29 #2 New Member   Join Date: Mar 2014 Posts: 11 Rep Power: 4 I had some similar issues and just use put another if with the inverse statement. In your case it would be if (C_VOF(c,ts) < 0.00001) It is anoying because it is slower but it works.

 June 11, 2014, 09:52 #3 New Member   Join Date: Nov 2013 Posts: 6 Rep Power: 4 Thanks Crow. I don't seem to understand what you mean. Are you saying I should use another if with inverse of the logical expression instead of else logical expression in which case it will become if (C_VOF(c,ts) >= 0.00001) { Z = 4675.47; x_p = 526890/C_UDSI(c,t,P); l_x = log(x_p); A = 8.31429*tem*l_x; C_UDSI(c,t,ADS)=0.301555862*exp(-(A*A*A)/(Z*Z*Z)); } if (C_VOF(c,ts) < 0.00001) { Z = 4675.47; x_p = 526890/C_UDSI(c,t,P); l_x = log(x_p); A = 8.31429*tem*l_x; C_UDSI(c,t,ADS)=0; } } end_c_loop(c,t) } } } Thanks

 June 13, 2014, 05:47 #5 New Member   Join Date: Nov 2013 Posts: 6 Rep Power: 4 Thanks Crow. I have done exactly that and yet it is not working. Was your case similar to mine? If yes did you do any other thing different and how long did your simulation run for? Thanks

 June 13, 2014, 09:43 #6 New Member   Join Date: Mar 2014 Posts: 11 Rep Power: 4 More information is needed in order to help you. 1) What are you trying to accomplish exactly with your UDF? 2) What is the error message/problem you are encounting to know that your UDF is not working? Edit: 3) What is the general configuration of your simulation? What are you simulating?

 Tags if else statement, udf, uds, volume fraction

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