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Hi Anthony, I assume you use Ansys Fluent? For heat transfer, 1) generally kw-SST is recommended, so you are good there. Further recommendations are 2) to have at least 10 cells inside the boundary layer. So you need to calculate the boundary layer thickness based on the Reynolds number. With...

@pierreick (Chemical) Hi Pierre, I don't see how I have been rude, at least compared to the rudeness in the posts of bimr. I count 18 posts from bimr in this thread, all of them wrong. As far as I understood, eng-tips is not an opinion forum, but a forum that should be based on science...

bimr, Your lack of understanding basic physics is shocking to be honest. Water is indeed compressible, not at lot, but it is compressible. That being said, the (in)compressibility is completely irrelevant to whether the pressure in the water will increase or not if the air pressure is...

Von Mises stresses should not be used for fatigue, since - as mentioned above - you can not see if the stress is compressive or tensile, as Von Mises stresses are always positive values. A common and (in my opinion, the most) simple method is using the Absolute Maximum Principal Stresses...

In (NX) Nastran you should look at the elemental stresses to be on the safe side. The elemental stresses are directly derived from the Gauss points (aka stress integration points) mentioned above. When your mesh is sufficiently refined, the difference between the nodal and elemental stresses...