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April 16, 2010, 16:32 
Advancement in twoPhaseEulerLESFoam

#21 
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Roro Wang
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Hi Alberto, Raagh, Juho, and others,
I am working on a particle cloud settling problem. I wonder whether dynMixSmagorinsky can be added. The single phase problem has been well addressed. I would like to know if any advancement has been done and be happy to be the first user. PS: Alberto, may I have a look at your code? Thanks in advance. Roro 

April 16, 2010, 17:30 

#22  
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Alberto Passalacqua
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Quote:
Quote:
Quote:
Best,
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Alberto Passalacqua GeekoCFD  A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats. OpenQBMM  An opensource implementation of quadraturebased moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using. 

July 1, 2011, 04:40 
twoPhaseLESEulerFoam

#23 
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Albrecht vBoetticher
Join Date: Aug 2010
Location: Zürich, Swizerland
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Hello Alberto and all particle settling Foamers,
I am quite interested in twoPhaseLESEulerFoam, too. I have so far used a modified interDyMFoam solver to simulate freeface fluid structure interactions of shallow landslides with flexible protection barriers in my PhD thesis, but since this is done i would like to work on erosion around piles in hyperconcentrated turbulent flows, as they occur during flood events. Could you imagine simulating particles in a turbulent HerschelBulkley rheology flow using twoPhaseEulerFoam? Please let me know if I can contribute. Regards, Albrecht (Albrecht v. Boetticher, albrecht.vonboetticher[at]wsl.ch, Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Züricherstrasse 111, CH8903 Birmensdorf) 

July 2, 2011, 02:34 

#24  
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Alberto Passalacqua
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Quote:
the solution algorithm should not have extreme difficulties to deal with nonNewtonian problems. In OpenFOAM 2.0.0 twoPhaseEulerFoam implements the PIMPLE algorithm, which makes it more stable. If you use the kinetic theory of granular flows, the treatment of the particle pressure is still explicit, and this makes the solution less stable in dense regions. You'll have to add the nonNewtonian model, but there should be no difficulty in managing large values of the viscosity (it's similar to what happens in a granular flow in the frictional regime, and there the algorithm, once the particle pressure is treated implicitly, works fine). Best,
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Alberto Passalacqua GeekoCFD  A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats. OpenQBMM  An opensource implementation of quadraturebased moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using. 

July 2, 2011, 11:08 

#25 
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Albrecht vBoetticher
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Hi Alberto,
thanks for these advices, the mixture of LES with nonNewtonian models causes discussions from a physical point of view, but the implementation works fine in interFoam and I think I'll run some simple experiments with a flume for validation. I will start writing the proposal in fall so that the project could start in next summer. But instead of dealing with the particles in twoPhaseEulerFOAM I think I will use InterFOAM and link it with an external discrete finite element code that traces the particles, and allows for complex bindings between the particles which makes it possible to simulate fishing nets as well as the foundation of piles in eroding granular material with different grain sizes. I thought about feeding the particle position and velocity to InterFOAM, together with a particle radius. Then finding all cells that ly within the particle radius and then work through the resulting actio and reactio forces, applied to the flow and to the particle. I will post the first trial tests when ready... 

July 2, 2011, 17:02 

#26  
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Alberto Passalacqua
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Quote:
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Alberto Passalacqua GeekoCFD  A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats. OpenQBMM  An opensource implementation of quadraturebased moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using. 

March 8, 2012, 08:33 
News on twoPhaseEulerFoam and LES

#27 
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Gerhard Holzinger
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Location: Austria
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Are there news on twoPhaseEulerFoam and LES?
Who has worked that out and how difficult is this? Will this combination be publicly available in the future? 

March 9, 2012, 04:38 

#28 
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Alberto Passalacqua
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Hi Gerhard,
if with LES you mean a Smagorinskytype model for the continuous phase, the implementation is easy, and can be based on what is already available into OpenFOAM.
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Alberto Passalacqua GeekoCFD  A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats. OpenQBMM  An opensource implementation of quadraturebased moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using. 

April 5, 2012, 20:26 

#29 
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yushi
Join Date: May 2010
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Hi, all,
I am trying to run twoPhaseEulerFoam with one of the RSTM. I am wondering if anyone has done this before or any instruction on how to modify the code? thank you in advance, yy 

April 6, 2012, 10:48 

#30  
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Alberto Passalacqua
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Quote:
Best,
__________________
Alberto Passalacqua GeekoCFD  A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats. OpenQBMM  An opensource implementation of quadraturebased moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using. 

April 8, 2012, 16:45 

#31 
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mohamed elshafey
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hi all
I am new in Open FOAM and I am starting my work on LES of an evaporating twophaseﬂow with LE approach.I built my code for the liquid phase.and i want to know if it is possible to find in OF for the gas phase a LES code solves the ﬁltered compressible NavierStokes equations and if i can add my source term in the code and integrate the gas solver with my liquid solver. mohamed 

April 8, 2012, 16:52 

#32  
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Alberto Passalacqua
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Quote:
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Alberto Passalacqua GeekoCFD  A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats. OpenQBMM  An opensource implementation of quadraturebased moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using. 

April 8, 2012, 17:07 

#33 
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mohamed elshafey
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thanks alberto for your help , what about the integration between LES gas solver and my liquid solver ?


April 8, 2012, 17:10 

#34  
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Alberto Passalacqua
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Quote:
Alberto
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Alberto Passalacqua GeekoCFD  A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats. OpenQBMM  An opensource implementation of quadraturebased moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using. 

April 8, 2012, 17:23 

#35  
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mohamed elshafey
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Quote:
the coupling (i need u, v,T,roh from LES solver & export the conductive heat ﬂux to it at each time step ) 

April 8, 2012, 17:27 

#36 
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Alberto Passalacqua
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This should not be too difficult: you can simply create an interface between the two codes. If you want to do things more cleanly, you probably should take a look at the Lagrangian solver already present in OpenFOAM, which includes heat and mass transfer too (see the combustion / diesel) solvers.
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Alberto Passalacqua GeekoCFD  A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats. OpenQBMM  An opensource implementation of quadraturebased moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using. 

April 8, 2012, 17:38 

#37  
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mohamed elshafey
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Quote:


April 9, 2012, 13:04 

#38 
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yushi
Join Date: May 2010
Posts: 4
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Thank you very much for your reply, Alberto.
I am trying the standard kepsilon model for now but the simulation is very unstable. I have to limit my Courant Number below 0.2 otherwise it will diverge. I am using limitedLinearV 1 for my convective terms and I am wondering if anyone has similar experience or any idea to improve it? Thank you. 

May 6, 2012, 18:07 

#39 
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mohamed elshafey
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hi alberto ,
I start to look at rhoPimpleFoam solver , I need your help to find some tutorial about governing equations and how to run the solver, Thanks for your help. mohamed 

May 6, 2012, 19:46 

#40 
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Alberto Passalacqua
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Hi,
the governing equations for rhoPimpleFoam are the continuity, momentum and energy equation of a compressible fluid. You can refer to Ferziger and Peric and Hirsch books, for example. For the tutorials, a starting point are the examples here ~/OpenFOAM/OpenFOAM2.1.x/tutorials/compressible/rhoPimpleFoam/ If you have questions, just ask on the forum :)
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Alberto Passalacqua GeekoCFD  A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats. OpenQBMM  An opensource implementation of quadraturebased moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using. 

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