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October 9, 2002, 09:14 |
Fluid / Particle Interaction
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#1 |
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Hi! I have a (hopefully trivial, at leat for someone out there) problem: I am trying to simulate the acceleration of abrasive particles (garnet) in a high velocity fluid stream. I have a pressure in- and outlet and a surface particle injection (fluid/particle interaction switched on). The problem is: After iteration, the particles have in every position exactly the same speed as the fluid, so that they appear not to have any inertia. What am I doing wrong? Thanks in advance, Alex
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October 10, 2002, 05:40 |
Re: Fluid / Particle Interaction
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#2 |
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hi i think u should try the fluid inlet and a solid inlet(high density fluid in eulerian- eulerian grannular model ) instead of the surface particle injection. that may help u . beacuse in surface particle injection solid behave as inerts. so they acuire same velocity as that of fliud.
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October 10, 2002, 10:49 |
Re: Fluid / Particle Interaction
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#3 |
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Have you turn on gravity ( a must)?
What is the density of your particles?, if small, inertial effects are not present. Is your particle tracking in unsteady state? Have you tried particle-flow interaction? All these factors have an impact on the behavior of your particle tracks. Try all of them. Cheers CFD Newbie |
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October 11, 2002, 05:53 |
Re: Fluid / Particle Interaction
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#4 |
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I am looking into moddeling a similar flow. I want to model diesel exhaust flow with very many different constiuants. is this possible in fluent. Any ideas. Thanks
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October 21, 2002, 12:21 |
Re: Fluid / Particle Interaction
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#5 |
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Alex:
Your particles will have have more or less the same velocity as the fluid if the particle size and/or density is very small (in this case fluid inertia dominates the particle inertia)and if the number of particles is not large enough to consider a 2-way/4-way coupling of the multiple phases. Also, as you would have observed, (for a 1-way coupling) the particles will follow the fluid streamlines all along unless there is any solid obstruction in their path. Hope this helps. |
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