|May 2, 2014, 17:20||
consistently underestimating lift on a naca 0024 profile.
Join Date: Nov 2013
Posts: 15Rep Power: 5
I have been trying to make do a static analysis of a NACA 0024 airfoil in fluent at 5 degrees AoA. But i have consitently been underestimating the Cl. I need to validate the model in this static configuration to move on to a dynamic flapping motion model.
I created the airfoil in solidworks and exported it as a parasolid file. I used ICEM to create a structured grid arround the airfoil and a unstructured grid outside the structured one.
i am working at Re=200.000 with water rho=999.7kg/m³ U=0.866666667m/s and viscosity=0.00129961kg/m-s and chord 0.3m turbulent intensity = 2% turbulent viscosity ratio=10
I am using second order space discretisation with the SIMPLE scheme. As a turbulence model, i use k-omega SST after hybrid initialization (low reynolds number correction not applied).
After modelling i get convergence but i consistantly get an underestimation of the Cl. i get Cl = 0.34208 and Cd = 0.02255 while Airfoiltools tells me that it should be Cl=0.4949 and Cd=0.01732
I have attached the y+ curve along the airfoil edge , it is not around one but i already have a cell heigth of 0.0001m at the airfoil boundary so i don't know if this is where the error get's created.
I have a picture of the mesh in the attachement and the Cl monitor as well as the unscaled residuals.
Does anyone have an idea of what might be going wrong? or something i might try to fix this ?
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