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Unsteady Results-Flow over a sphere

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Old   March 28, 2019, 10:02
Question Unsteady Results-Flow over a sphere
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mike
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Hi everyone,



i have a question about my unsteady cfd results. I am simulating a time-dependent (unsteady at inlet velocity 20 m/s) flow over a sphere with Star CCM+ which is in the middle of the wind tunnel. Also some pictures are saved in every time-step.



After some time-steps I mean the time= about 0.5 s, the velocity and also vorticity distributions change really minimally, as opposed to the time between 0-0.5s. So that i cant see the turbulent structures on these distributions. The solution is like an end result of a steady state!

(Time-Step is chosen= 0.002s)



I have expected that the periodic fluctating behaviour could be clearly seen.

Is it normal that the flow can be stable in this case? Or is it unrealistic how I define the problem?



Thanks in advance.
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aerodynamic, sphere, star ccm+, unsteady

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