Hello , I think you have two mistakes in your analysis, the first one when you used the y + calculator website to find the first layer height, you used the L as 0.288 m, this should be the length parallel to the flow , therefore L should be 1.044 m. Also for the references values , L should be 1.044m and not 1 m.

@vincentcfd9806

3 жыл бұрын

The "correct" y+ has to be taken from CFD post after the analysis to ensure y+ values around the body are within the limits and do the refinement at the areas outside the y+ limits (for example the legs etc). For drag calculation cross sectional area is used instead of length. You just have to mention the drag calculation of your study is based on length or area. In 3D analysis reference area (for example cross section area for bluff bodies) is normally used.

@RS-qe7mj

3 жыл бұрын

@@vincentcfd9806 in your video at time 12.50 when you used the pointwise calculator for the y+, you entered L = 0.288 m which gave you Reynolds value of 552050.9668. This is not correct because to find the Reynolds value of external flow, the length should be the one parallel to the flow and not the perpendicular one , therofe you should enter L =1.044 m and not 0.288 m. Also for the reference values section, the area is correct but you kept the L as 1 m which is the default value in the reference section, L should be entered as 1.044 m in the reference values section. Could you check this because it is important to enter the correct values.

@vincentcfd9806

3 жыл бұрын

@@RS-qe7mj you may want to check the definition of characteristic length. It does not necessarily parallel to the flow. For example a flat plate placed perpendicularly to the flow, the length of the plate is the one we use to calculate the Re, not the thickness. L was taken as 1 (the default value) because we didn't intend to find Re in postprocessing. If you want to plot the Re in the CFD post then the length is important. But still, the Re value depends on which characteristic length you want to use in your analysis.