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transient flow simulation shows odd behaviour |
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March 12, 2021, 09:25 |
transient flow simulation shows odd behaviour
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Nederland
Join Date: Mar 2021
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Hello everyone,
For school I have to analyse a flow past a needle valve. To make sure all the settings are right I want to do a simple simulation that doesn't take too much computing time. The idea is to perform a transient flow simulation around a cylinder. The results should look something like this: vortex shedding around a cylinder.jpg (The vortex shedding is moving of course, but the velocity at the inlet, walls and outlet stays mainly the same) I posted a video on vimeo of the results regarding my simulation: https://vimeo.com/522807243/d441011624 The high velocity in the whole fluid is moving back and forth. Only the velocity at the inlet stays the same but furthur in the fluid domain it starts to fluctuate. The velocity and pressure plots show the fluctiation: pressure.JPG velocity.JPG For clarification some settings of the simulation: mesh size.JPG mesh: mesh sizelength of the box: 200mm diameter cylinder: 9mm boundary conditions inlet: inlet flow 10 m/s outlet: opening symmetry plane solution parameters serial solver k-epsilon turbulence model transient time interval: 0 - 0.009 sec time step: 0.000045 sec results: match integration times does someone know what I'm doing wrong? Thanks in advance, Jesse van Asseldonk |
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