Object of interest is fluid flow over tube in heat exchanger.
Does Inflating layers need to be on both sides: on fluid side (air) and solid body (tube)?
If yes, thus number of layer have to be same (for example 10) or can be different.
hoping this helps you. Good luck.
http://www.computationalfluiddynamics.com.au/tips-tricks-inflation-layer-meshing-in-ansys/
You want inflation layers on the fluid side in order to better resolve the fluid boundary layer.
Unless your solid is very complex, heat-transfer will occur with conduction only which is a linear process. No need for inflation.
A. Lemoueda, A. Schmid, E. Franz in his article (for serrated finned tube heat-exchanger) present mesh with 6 prism layers on fluid side (air) and 3 layers in solid region. ?!
Unless you suspect very strong gradients and multi-dimensional heat-flow in a cartesian or mapped mesh, it is probably unneccessary. In serrated elongate fins where the heat-flow is mostly 1D, I would think it is overkill.
But I do not have access to the paper in question.
According my investigation, inflation layers is not needed on solid body. Better solution is use Sizing to control size of cells. This is important to obtain good aspect ratio and skewness for mesh which influence better or worse convergetion of iterations. Inflation layers on fluid side is nessery.
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