March 23, 2023 at 9:56 pm
March 24, 2023 at 6:52 amSRPSubscriber
Transport equation consists of unsteady term, convection term, diffusion term, and source term. Can you please explain what the underline term describes?
March 24, 2023 at 7:43 amMeyzeehSubscriber
The equation describes the transport of a radioactive gas called thoron an isotope of radon with a half-life of t1/2= 55.6 s. As seen from the equation all the other terms you mentioned are taken care of except for the extra term which accounts for the radioactive decay of the thoron. The λ is the decay constant of the thoron and is defined as λ= ln 2/t1/2= ln 2/(55.6 s) =1.25x10^-2 s^-1. I could probably include that term in the source term but I don't know how to edit the source term in the general transport equation in ansys cause I'm new to ansys. Please help
March 26, 2023 at 7:27 pmMeyzeehSubscriber
March 27, 2023 at 6:08 amSRPSubscriber
You can create a UDF using a macro DEFINE_SOURCE.
For more details, I recommend you to refer to Fluent Customization manual: 2.3. Model-Specific DEFINE Macros (ansys.com)
If you are not able to access the link, please refer to this forum discussion: https://forum.ansys.com/forums/topic/using-help-with-links/#latest
March 29, 2023 at 8:59 amMeyzeehSubscriber
Thank you very much for your help. I will try that.
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