Reynolds number regime map with typical critical values: about 2300 to 4000 for pipe flow, 5×10^5 for a flat plate, and 2×10^5 to 5×10^5 for the drag crisis on cylinders and spheres

CFD

Reynolds Number: Formula, Critical Values and Calculator

Reynolds number explained: the formula, how to choose the characteristic length and hydraulic diameter, critical values by geometry, and a free calculator.
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y+ and wall treatment in CFD: law of the wall u+ versus y+ with viscous sublayer, buffer, log-law and outer regions, a wall-resolved first cell at y+ of about 1 and a wall-function first cell at y+ of about 50

CFD

y+ Calculator and Wall Treatment in CFD: Wall Functions and First Cell Height

Free y+ calculator for CFD: get the first cell height for any fluid and speed, then learn wall functions, the law of the wall and wall treatment by flow type.
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