In other words, the local acceleration of an airflow, over the top of a wing, over the speed of the bulk airflow.
For example, if you have a car going 60mph, but the airflow is being accelerated to 120mph, then you would have a large Strouhal number, and the flow would be dominated by oscillations from vortex shedding. Whereas if the airflow is decelerated below the bulk flow, then you'd have a small Strouhal number, because the bulk flow would be greater than the frequency and amplitude.
I think.
In other words, the local acceleration of an airflow, over the top of a wing, over the speed of the bulk airflow.
For example, if you have a car going 60mph, but the airflow is being accelerated to 120mph, then you would have a large Strouhal number, and the flow would be dominated by oscillations from vortex shedding. Whereas if the airflow is decelerated below the bulk flow, then you'd have a small Strouhal number, because the bulk flow would be greater than the frequency and amplitude.
I think.
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