DFBI CFD simulation of ball valve with contact and collision

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Here we see a ball valve CFD simulation carried out entirely within STAR-CCM+ where the inlet pressure varies sinusoidally from a negative to a positive driving pressure difference. Initially the ball is in position closing the valve, with the pressure and gravity forces in perfect balance with the new contact coupling force, prior to STAR-CCM+ v9.04 the ball would have drifted through the wall. As the driving pressure goes positive and becomes sufficient to overcome gravity, the ball lifts up and collides with the retaining ring above which it then bounces off a few times before settling in place. The driving pressure then drops and the ball returns to it’s initial position.

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