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Fluid slows down before reaching airfoil

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Old   February 16, 2020, 11:11
Default Fluid slows down before reaching airfoil
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To all,
I am trying to run a 2-D simulation of compressible flow past a cone in ANSYS Fluent. However, the air seems to slow down immediately after the inlet boundary for some reason, and I don't understand why. I've included a picture of the issue, and my settings are as follows:
model: realizable k-epsilon, standard wall functions
fluid: air, ideal gas
boundary conditions:
velocity inlet, 375 m/s
walls: no slip on the cone, specified shear of 0 on the boundaries

Any advice on this would be appreciated!
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Old   February 16, 2020, 16:14
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The image shows temperature and not velocity, hence, it is little difficult to say whether the flow slows down or not. But there are other settings that imply improper setup. You need to make following changes

1. Use SST k-\omega instead of k-\varepsilon. You may also use SA. If you wish to continue with k-\varepsilon, use ML instead of SWF.

2. Velocity inlet is wrong boundary condition for compressible flows. Use farfield or pressure-inlet or mass flow inlet. Farfield is most optimum.

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