[Robbb]

Hello everyone!
I wrote this UDF to define a reaction rate:

#include "udf.h"
DEFINE_VR_RATE(user_rate, c, t, r, mole_weight, species_mf, rr)
{
real s1 = species_mf[0];
real mw1 = mole_weight[0];
*rr=(2.303/12.6)*s1*mw1;
}


which seems to work.
Now I need to insert a -temperature dependent- value of D (which is constant in this udf and is 12.6 ). The dependence is D=12.6/ 10^((T-121)/10)
How can I insert it?

[ComputerGuy]

Please see my reply in this thread:http://www.cfd-online.com/Forums/flu...botulinum.html

Originally Posted by Robbb

Hello everyone!
I wrote this UDF to define a reaction rate:

#include "udf.h"
DEFINE_VR_RATE(user_rate, c, t, r, mole_weight, species_mf, rr)
{
real s1 = species_mf[0];
real mw1 = mole_weight[0];
*rr=(2.303/12.6)*s1*mw1;
}


which seems to work.
Now I need to insert a -temperature dependent- value of D (which is constant in this udf and is 12.6 ). The dependence is D=12.6/ 10^((T-121)/10)
How can I insert it?