hi
 

hi, anybody know the difference between log and natural log in Fluent UDF. i go through many UDF , every one used log, instead of natural log (ln). if anybody know the answer please share.

thanks

The difference is a factor 2.30258509299.
Can you be more specific with your question? If I google for "difference between log and natural log", I get many many websites which explain this difference. Doesn't that help you?

hi
 

hi pakk, thanks for the answer. actually i want to know the difference with respect to the Fluent UDF. because i feel that,in fluent UDF, every where "log" is used instead of "ln". actually i want to make a UDF of "law of wall" given in this link below
http://en.wikipedia.org/wiki/Law_of_the_wall

that's why i was thinking that may be in fluent both are similar.
regards.

UDFs in Fluent are written in the "c" programming language.

If you want to know what a function does in "c", you can look for example here.

From that website:

Hello,
I wonder if you find a solution for your work cause i have the same problem. architect and want to assign a velocity profile into the inlet.
help me please!!

tnx a lot

Hello,

I need to use a relative height for my velocity profile and I need to give this as input in my UDF. Does someone have experienced the same need and would like to share how he/she managed?

My domain is split in several sub-domains and therefore there are several face zones (patches) for inlet, ground etc..

Thanks,

Fabio