Modified twoPhaseEulerFoam

alberto · November 7, 2006, 07:51

I can finally release the modified version of twoPhaseEulerFoam.
It includes:

- Two additional drag models for gas-particle flows (Gidaspow, Syamlal-O'Brian).

- Additional radial distribution functions for the kinetic theory and their derivative.

- Additional granular pressure models and derivatives of the granular pressure coefficient.

- Additional frictional stress models.

- Variable averaging.

- Implementation of a "packing limiter" algorithm to try to stabilize the solution when the kinetic theory is used.
The implemented algorithm is just a trick to avoid numerical instabilities due to the discontinuity in the radial distribution function at the packing limit. However it requires quite a small time step. I think a more refined, less intrusive and robust method is needed such as some sort of relaxation of the granular pressure coupled to an implicit limitation on the particle-phase volume fraction similar to what done when the normal stress modulus is used in the same solver. Ideas and volunteers are welcome ;-)

- Correction of the zeroGradient BC proposed by Henry Weller and sent to me by Rasmus (thanks!).

I attach the code, an example and a detailed list of changes.

alberto · November 7, 2006, 08:09

Sorry for the multiple post. I has some problem due to the size of the attachments.
The code and the changelog are here:

twoPhaseEulerFoam.tar.gz

Changes

The example case is too big to be uploaded. It can be downloaded here:
http://www.albertopassalacqua.com/in...id=9&Itemid=27

Best regards,
Alberto

November 7, 2006, 07:51	I can finally release the modi	#1
alberto Senior Member Alberto Passalacqua Join Date: Mar 2009 Location: Ames, Iowa, United States Posts: 1,912 Rep Power: 36	I can finally release the modified version of twoPhaseEulerFoam. It includes: - Two additional drag models for gas-particle flows (Gidaspow, Syamlal-O'Brian). - Additional radial distribution functions for the kinetic theory and their derivative. - Additional granular pressure models and derivatives of the granular pressure coefficient. - Additional frictional stress models. - Variable averaging. - Implementation of a "packing limiter" algorithm to try to stabilize the solution when the kinetic theory is used. The implemented algorithm is just a trick to avoid numerical instabilities due to the discontinuity in the radial distribution function at the packing limit. However it requires quite a small time step. I think a more refined, less intrusive and robust method is needed such as some sort of relaxation of the granular pressure coupled to an implicit limitation on the particle-phase volume fraction similar to what done when the normal stress modulus is used in the same solver. Ideas and volunteers are welcome ;-) - Correction of the zeroGradient BC proposed by Henry Weller and sent to me by Rasmus (thanks!). I attach the code, an example and a detailed list of changes. __________________ Alberto Passalacqua GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats (current status: http://albertopassalacqua.com/?p=1541) OpenQBMM - An open-source implementation of quadrature-based moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using.

November 7, 2006, 08:09	Sorry for the multiple post. I	#2
alberto Senior Member Alberto Passalacqua Join Date: Mar 2009 Location: Ames, Iowa, United States Posts: 1,912 Rep Power: 36	Sorry for the multiple post. I has some problem due to the size of the attachments. The code and the changelog are here: twoPhaseEulerFoam.tar.gz Changes The example case is too big to be uploaded. It can be downloaded here: http://www.albertopassalacqua.com/in...id=9&Itemid=27 Best regards, Alberto __________________ Alberto Passalacqua GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats (current status: http://albertopassalacqua.com/?p=1541) OpenQBMM - An open-source implementation of quadrature-based moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using.

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