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May 21, 2012, 14:59 |
Straight through cyclone with particles
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New Member
Roger Hoffmann
Join Date: Apr 2011
Posts: 3
Rep Power: 15 |
Hi,
I am running some cases of a straight through cyclone, with particles. I am running it steady state, air ideal gas, k-epsilon, with Uniform in Diameter by Mass distribution (see below). It all seemed to work fine for a series of calculations, but when I was changing some variables like, temperature (increased some degrees), reduced density of the particle material, then I began to obtain results with about 30% - 50% of the particles EXCEEDED INTEGRATION LIMIT, or DISTANCE or TIME. I tried many times to increase this limits, but all I had was huge computational time, and the results did not improve much. My questions: 1 - Do this particles that are being terminated affect the results, or they can be just ignored? 2 - I understand that this particles are being trapped in some region of the flow. How to discover where is this happening? Could this be a mesh issue? 3 - Is it possible to know which particles are being trapped, where they originate, or their diameter? 4 - I used the Injection at Face Centres at first, but when I wanted to increase the number of particles using uniform injection (to improve the results), I also had lot of particles being terminated. Why? It seems that only using Injection at Face Centres and certain conditions I can run without particles being terminated. Any tips, suggestions, could help. Thank you, Roger FLUID: Particulas BOUNDARY CONDITIONS: MASS AND MOMENTUM: Option = Zero Slip Velocity END PARTICLE DIAMETER DISTRIBUTION: Maximum Diameter = 1 [mm] Minimum Diameter = 0.54 [micron] Option = Uniform in Diameter by Mass END PARTICLE MASS FLOW RATE: Mass Flow Rate = 6.94e-4 [kg s^-1] END PARTICLE POSITION: Option = Injection at Face Centres END END |
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