|February 19, 2014, 04:00||
Meshing of bullet farfield (via inflation)
Join Date: Feb 2014
Posts: 3Rep Power: 2
I'm currently investigating in the Aerodynamics of a flying bullet. I'm quite comfortable with the set-up I use.
The bullet analysis is for speeds up to 3 Mach, attack angles up to 6 degrees, and a rotational bullet (wall) of up to 22 000 rad/s.
The results I get is almost acceptable, except the force in z direction and moment around y-axis on the centre point of bullet (Magnus force and Magnus moment). These values jump around a lot and never converged to the same value even if the same conditions is run again.
I have a feeling this is about the mesh, I'm currently just using the meshing system inside ANSYS with just the default inflation from the body towards a greater outfield. I tried to refine the mesh around the bullet and inflate more and more gradually with extensive bodies but with no luck. when I ran the simulation in Fluent I get an "Floating point f" error. I really tried a lot of different meshing techniques with no luck
I also know the "floating point f" error can be because of lost units...
Is there anyone that maybe can assist me in the mesh?
|bullet, farfield, fluent, inflation, mesh|
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