|
[Sponsors] |
June 10, 2009, 14:59 |
Questions of fluid pairs
|
#1 |
New Member
Francisca
Join Date: Jun 2009
Posts: 14
Rep Power: 17 |
Hello. I'm doing a simulation on CFX. My case is distribution box, or a kind of launder, that has one input and 3 outputs. It's isothermal and transient. I have three phases involved: water, air, and particles. The water transports the particles, and the air is above. I did my case already with water and air, and it was OK. The thing is that now, I'm not sure about the fluid details and the fluid pairs. My questions are the following:
1. For the particle phase, in fluid details-morphology, I put dispersed fluid. This is because I want to use an Eulerian-Eulerian model. If I put dispersed solid I'm I using Lagrangian method? 2. For fluid pairs, for the pair water-particles, under interphase transfer I only have the options of free surface or particle model. Does particle model mean I'm using Lagrangian particle tracking? 3. In fluid pairs, under interphase transfer, for water-air I used free surface. I'm not sure what the difference is between this and mixture model. 4. In fluid pairs, under interphase transfer, for particle-air I used free surface. I'm not sure if this is OK, because the particle phase should carried by the liquid, and I don't know what interaction should it have with the air. Is free surface OK? Thank you very much. Francisca |
|
June 10, 2009, 18:36 |
|
#2 |
Senior Member
George
Join Date: Mar 2009
Location: Birmingham, UK
Posts: 257
Rep Power: 18 |
firsly I'd suggest for you to have a review on the multiphase section in cfx manual
an Eulerian-Eulerian particle transport assumes all particles have the same mean diameter and have the velocity of the transporting fluid etc etc.. for a Eulerian-Lagrangian particle tracking setup you have more options to chose from including the effect of the particle on the flow, particle size distribution and many more. this is two totally different models and to distinguish how you set them up for the Eulerian-Lagrangian particle tracking setup its the particle tracking option in the first tab of your domain settings window. as for the rest of your questions before proceeding any further with your model I'd suggest to revisit the tutorials with the chimney with smoke, the mixing vessel and the air bubbles.
__________________
Top 4 tips 1. Knowledge is everything and Ignorance is dangerous. 2. Understand your limitations and try to eliminate them. 3. Get yerself a bike and hoon the chuffer. You will soon learn why dogs like to hang their heads out the car window. 4. Please before asking any questions on how to run simulations in CFX, go though all the tutorials |
|
Tags |
ansys, cfx, cfx11, cfx11.0, multiphase |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Fluid pairs | fjalil | Main CFD Forum | 0 | June 10, 2009 14:47 |
questions about computational fluid dynamics | jyothi | Main CFD Forum | 12 | April 27, 2007 10:43 |
fluid mehanics questions | Nadia | Main CFD Forum | 1 | April 9, 2007 09:31 |
How to apply negtive pressure to outlet | bioman66 | CFX | 5 | June 3, 2006 02:40 |
Terrible Mistake In Fluid Dynamics History | Abhi | Main CFD Forum | 12 | July 8, 2002 10:11 |