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April 13, 2021, 06:27 |
First cell-height for aircraft Simulation
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#1 |
Member
Join Date: Apr 2016
Posts: 90
Rep Power: 10 |
Hello,
I am trying do a simulation of a small aircraft in order to estimate the drag coefficient. 1.: In order to reduce the number of cells, I want to use standard wall function. So I am trying to set y+ between 30 and 300. My question: which reference length should I use in order to calculate the first cell height? a) When I use the chord length of the airfoil as reference length I will need a smaller first cell height than using the fuselage as reference length. In order to be sure that y+>30 I should then go for the fuselage first cell height? b) And what is my free stream velocity? The wing is accelerating the incoming air. So when I set to my farfield boundary Mach=0.7 , is this my free stream velocity (for calculating first cell height) or should I approximate the velocity on the airfoil and use this as free stream velocity (around Mach=0.9) ? 2. Do you think it is important to NOT work with wall functions for solving for drag coefficient of an aircraft (with high angle rudders) ? Thanks for your thoughts Best regards CellZone |
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