Dear all,
I want to simulate the distribution of relative humidity inside an agricultural greenhouse. I have modelled the relative humidity in fluent using the Species model. the model works perfectly, but when I display the relative humidity contours, sometimes it exceeds 100% !!!
I know that is normal because Fluent uses a mathematical formula to calculate the RH.
but what I want now is to ask if i can write an udf to modify the results of relative humidity as follows:
if RH > 100 ----> Rh = 100??? or does anyone have another solution!!!
I'd be appreciated for any help.
Hi K. Ezzaeri,
if I got your question correctly, the RH is your dependent variable. I can imagine, that the computed RH actually does not exceed 100%, but you used "node values" in postprocessing. Thus, Fluent will take the information/computed value from the center of the cell and interpolate/extrapolate to the nodes to get the value there. In this way, unphysical values can apper.
If this is not the case and since the RH is the variabel you are solving for, you can simply limit the numerical range for its value. This is done by going to Solution - > Controls -> Limits.
In the case you want to use a UDF for this task, you would need to use a DEFINE_ADJUST macro and the if condition you mentioned to adjust the values of RH in the computational domain.
I would recommend to try with options 1 and 2 and if it does not help, to try to write an UDF.
Best of luck!
Antoni
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