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March 4, 2019, 23:19 |
soot modelling without chemistry
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#1 |
Senior Member
Svetlana Tkachenko
Join Date: Oct 2013
Location: Australia, Sydney
Posts: 416
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Hello,
In ansys cfx there is 'air ideal gas' (fluid) and 'soot' (solid). How do I model a mixture of these two materials? I can specify the mass fraction of soot but I am seriously struggling to find the button for the 'mixture of fluid and solid' option, is it required to activate a particle model somewhere? If so, where? Please advise. Regards, Svetlana |
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March 5, 2019, 00:22 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
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Have a look at the CFX tutorial examples. There are multiphase model examples of all the main types of flow, including solid particles like you are considering.
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March 7, 2019, 21:38 |
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#3 | |
Senior Member
Svetlana Tkachenko
Join Date: Oct 2013
Location: Australia, Sydney
Posts: 416
Rep Power: 15 |
Quote:
This requires me to specify the dynamic viscosity, conductivity, and density. I was able to find the density of soot particles in existing papers, and conductivity, but not the viscosity. Even as a function of particle size would be great to have. For some reason this simplified approach does not appear to be included in existing literature. |
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March 7, 2019, 22:14 |
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
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You can't model soot as a fluid as it is not a fluid.
You have three main options: 1) A Eularian particle phase 2) A Lagrangian particle phase 3) An additional variable, with convection and possibly diffusion. Option 3 is by far the easiest, but really only allows you to track the motion of the soot. Option 1 is reasonably easy and allows additional physics like relative slip between the particles and the fluid. Option 2 is by far the hardest and most computationally expensive. It allows you to track the path of individual soot particles.
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March 7, 2019, 22:41 |
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#5 |
Senior Member
Svetlana Tkachenko
Join Date: Oct 2013
Location: Australia, Sydney
Posts: 416
Rep Power: 15 |
Thanks, is there any example (paper or tutorial) about option 3, please? I could find energy source term for radiation of soot particles, but not the additional variable.
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