Hello everyone,
I am modeling a system in which the temperature of a ground needs to change with time and with depth. A thin pipe (carrying hot liquid) is passing through the ground and the temperature of the soil around the pipe is affected by that.
So, how do I provide a time-dependent cell zone temperature condition? I cannot use "Fixed Value" because the temperature profile inside the soil needs to be affected by the pipe. Can I use "Source Term" somehow for this?
I must write a UDF but how and where do I use it? Please help me out.
The equation is:
T_soil = T_avg - A exp[-z (π/365a)^(1⁄2) ]∙ cos{2π/365 [t-t0 - z/2 (365/πa)^(1/2) ]}
Hello Reze, As you said, you can easily use the UDF to define the parametric temperature for your geometry. You can take look at the UDF manual which is available in the Internet and see extensive examples are available in this manual, so you can modify these examples to meet your boundary profile function. Anyway, if you couldn’t find similar UDF you can submit your problem in the CFD online forum(I am sure you can easily find and write your own UDF by looking example in the UDF manual). Yours, Siamak
Hi, Why do you think you have to define it as the initial condition? It is clear that is transient boundary condition, so at first step you have write your appropriate UDF and then compile or interoperate in the FLUENT, and finally define it in the boundary condition section (you have to enable the energy in the solver model). If you are not very familiar with FLUENT or UDF, you can do some available simple examples in the tutorials. Yours, Siamak
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