Learning Forum

[Jee Loong Hee]

Hello,

I would like to ask before attempting this approach, if I have a problem that looks like (heat transfer and mass transfer/fluid flow in a heat exchanger where two fluids in separating pipeline flow in different directions but exchanging heat). I.e,

• Construct zone 1 fluid + pipe wall as conformal 
• zone 1 fluid + pipe is covered by zone 2 fluid (the nodes of zone 2 fluids not align with zone 1 wall pipes)
• zone 2 fluid + its outer wall pipe as conformal
• zone 2 fluid also has an inlet and outlet. So in total 2 inlet, 2 outlets. 

Will the convective heat transfer (in fluid zone 1 & 2) and the conduction and heat losses in between walls works well (version 2022)? My plan is to save number of cells and obtaining a quick convergence. I found it unnecessary to keep all 2 zones conformal which slow down simulation. Does it works for multiphase flow? 

Thanks.
Jee 

[Rob]

It'll work, but you may need to define the nonconformal manually as it'll be fluid-solid. Work well and converge are a different matter, and even assuming the mesh etc are good that's less simple because you have two detached fluid domains. 

If you're adding phase change and/or multiple phases into one or both domains it's going to get more complicated. 

Fluid-fluid system coupling was designed to work in this scenario but I've not tried it before, nor do I know how good the tutorials are: have a look in the System Coupling part of the documentation.