[eternallearnerishak]

Hi community,
I have a basic question. How dependent is temperature on y plus for external aerothermal flows. Could you please share your experience with SST k-w model.

[Hamidzoka]

Hi,
If it is a pressure driven problem, Yplus value can change if viscosity and density change significantly by temperature. In case of temperature driven problems like buoyancy, however, temperature variations can have a more substantial impact on it through changing the physics of the flow.

Best

[sbaffini]

Originally Posted by eternallearnerishak

Hi community,
I have a basic question. How dependent is temperature on y plus for external aerothermal flows. Could you please share your experience with SST k-w model.

Which temperature and which y+? Also, how does this relate to the SST k-w model?

Maybe you want to know how sensitive to y+ is a computed surface temperature distribution when using the SST k-w model on a mesh with a given y+ for that surface?

This kind of depends from the solver you are using and, indeed, the current y+ value and kind of flow. For example, if your current y+ value is 2, there is possibly already little sensitivity going to 1 or 3. If your current value is 15, depending from how the wall function is implemented and which wall function formulation is used, you might experience larger sensitivities. This is especially so if there are large streamwise pressure gradients that the wall function doesn't take into account.