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Physics
Classical Physics
Mechanics
Velocity change under drag and other forces: small mass, large delta-t
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[QUOTE="jrmichler, post: 6289510, member: 638574"] Your initial time step must be such that the velocity changes by less than 10%, and preferably less than 1%. A general rule in simulations where the results diverge rapidly is to first try smaller time steps until you have at least 5 or 10 time steps per cycle or until it behaves properly. A good rule of thumb is to always make at least one run with a time step significantly shorter than the time step that seems to work. Also, if you search [B]drag coefficient sphere[/B], you will note that the drag coefficient is a function of Reynolds number. Note also that this approach may not apply in your case, so also search [B]Stoke's Law, [/B]which does apply. [/QUOTE]
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Forums
Physics
Classical Physics
Mechanics
Velocity change under drag and other forces: small mass, large delta-t
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