UDF for the heterogeneous gas-char reaction rates, using a numerical solution -- CFD Online Discussion Forums

March 9, 2011, 06:44	UDF for the heterogeneous gas-char reaction rates, using a numerical solution	#1
yummy0917 New Member Join Date: Feb 2011 Posts: 2 Rep Power: 0	I've written a UDF for the heterogeneous gas-char reaction rates with the function DEFINE_PR_RATE, which includes an auxiliary function zbrent_pr_rate, because there is no analytical solution for my equation. But zbrent_pr_rate seems out of work, since this auxiliary function returns are never zero but "ifail" still equals to FALSE, really weird I can't find any concrete explanations for this function in Fluent help.Is there anyone have relevant experience of this function? Thanks in advance!

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