Guidance for multicomponent multiphase flow simulation April 08, 2012 12:12PM |
Registered: 7 years ago Posts: 12 |

Hello Friends,

After simulation of single component multiphase flow (SCMP), i am trying to simulate multicomponent multiphase flow (MCMP) using the procedure described in the book "Lattice boltzmann modeling, an introduction for geoscientists and engineers". It seems as if it contains insufficient data for simulation. like, I donot know that parameters i should provide as input(density initialization should be same as in SCMP by a random no. or by

directly providing distribution function)? what more input is needed? what should be value of G? how output would look like if plotted on TECPLOT 360 (like the output of SCMP was shown in the above mentioned book, so i compared my results with it)???

Please can anybody refer me the useful text for writung a fortran code for this problem.......

Thanks in advance,

Best Regards

After simulation of single component multiphase flow (SCMP), i am trying to simulate multicomponent multiphase flow (MCMP) using the procedure described in the book "Lattice boltzmann modeling, an introduction for geoscientists and engineers". It seems as if it contains insufficient data for simulation. like, I donot know that parameters i should provide as input(density initialization should be same as in SCMP by a random no. or by

directly providing distribution function)? what more input is needed? what should be value of G? how output would look like if plotted on TECPLOT 360 (like the output of SCMP was shown in the above mentioned book, so i compared my results with it)???

Please can anybody refer me the useful text for writung a fortran code for this problem.......

Thanks in advance,

Best Regards

Re: Guidance for multicomponent multiphase flow simulation June 28, 2012 10:29PM |
Registered: 8 years ago Posts: 5 |

Hi,

I have been trying to reproduce the SCMP results of the Sukop books, but after few iterations the simulation converges to uniform densities at all sites. The same problem happens when I am doing 3D MCMP using Shan-Chen approach. Would you please send me your SCMP code, so that I can investigate the possible sources of error in my code?

Best

Shahram

I have been trying to reproduce the SCMP results of the Sukop books, but after few iterations the simulation converges to uniform densities at all sites. The same problem happens when I am doing 3D MCMP using Shan-Chen approach. Would you please send me your SCMP code, so that I can investigate the possible sources of error in my code?

Best

Shahram

Re: Guidance for multicomponent multiphase flow simulation June 29, 2012 02:09AM |
Registered: 7 years ago Posts: 8 |

Re: Guidance for multicomponent multiphase flow simulation June 29, 2012 06:40AM |
AdminRegistered: 7 years ago Posts: 105 |

Hi,

To share data with other forum participants, you can post it to the Community Wiki.

Cheers,

Jonas

To share data with other forum participants, you can post it to the Community Wiki.

Cheers,

Jonas

Re: Guidance for multicomponent multiphase flow simulation June 29, 2012 06:06PM |
Registered: 7 years ago Posts: 12 |

Re: Guidance for multicomponent multiphase flow simulation June 29, 2012 06:24PM |
Registered: 7 years ago Posts: 12 |

Re: Guidance for multicomponent multiphase flow simulation June 29, 2012 06:27PM |
Registered: 7 years ago Posts: 12 |

Re: Guidance for multicomponent multiphase flow simulation July 02, 2012 04:05AM |
Registered: 8 years ago Posts: 5 |

Re: Guidance for multicomponent multiphase flow simulation July 06, 2012 03:55PM |
Registered: 7 years ago Posts: 7 |

Hi Pinki

I am also doing some part time research in LBM , especially Multi component/phase flow.

I,along with my mentor have been trying to write MCMP code, using Sukop's book ,but to no avail.

Though We learnt certain things, which I want to share here:

1. Value of G: low value of G will make the two fluids miscible in one another, but if we take the value of G too large then numerical instabilities will occur. So start with a low G, then keep on increasing it till you stop getting stable soulutions.

2.You can initialize with a random value of density. Just remember that use this initial density to define your initial distribution functions.

But I also need your help. As I said, my code is not giving verifiable results . SO if you could share with me your code (SCMP & MCMP ), then That would go a long way in making me debug my own code. I have been working on this for months.

My email id is : vish.anand.iit@gmail.com

Thanks

Vishal

I am also doing some part time research in LBM , especially Multi component/phase flow.

I,along with my mentor have been trying to write MCMP code, using Sukop's book ,but to no avail.

Though We learnt certain things, which I want to share here:

1. Value of G: low value of G will make the two fluids miscible in one another, but if we take the value of G too large then numerical instabilities will occur. So start with a low G, then keep on increasing it till you stop getting stable soulutions.

2.You can initialize with a random value of density. Just remember that use this initial density to define your initial distribution functions.

But I also need your help. As I said, my code is not giving verifiable results . SO if you could share with me your code (SCMP & MCMP ), then That would go a long way in making me debug my own code. I have been working on this for months.

My email id is : vish.anand.iit@gmail.com

Thanks

Vishal

Re: Guidance for multicomponent multiphase flow simulation July 06, 2013 07:53AM |
Registered: 6 years ago Posts: 5 |

Hey guys,

I know this reply is a year late but I'm currently trying to simulate a spray using LBM. I've written the code in Matlab, but I'm having a few problems with stability.

1) As soon as I increase the density ratio of the fluids (above say 3:1, ratio of density of fluid being injected to density of surrounding fluid) the program becomes numerically unstable.

2) The same thing happens on increasing the velocity of injected fluid, and on increasing the Greens function (G).

Can you please tell me the reason for this. I would greatly appreciate it if you could help me in this regard.

Thanks,

Vikram

I know this reply is a year late but I'm currently trying to simulate a spray using LBM. I've written the code in Matlab, but I'm having a few problems with stability.

1) As soon as I increase the density ratio of the fluids (above say 3:1, ratio of density of fluid being injected to density of surrounding fluid) the program becomes numerically unstable.

2) The same thing happens on increasing the velocity of injected fluid, and on increasing the Greens function (G).

Can you please tell me the reason for this. I would greatly appreciate it if you could help me in this regard.

Thanks,

Vikram

Re: Guidance for multicomponent multiphase flow simulation July 08, 2013 10:10PM |
Registered: 6 years ago Posts: 3 |

Hey everyone,

Just like Vikram, I am going to restart the old discussion, as I also share the more or less same pain as he has :)

I have been trying to use SC model for a moderate density ratio static bubble (just up to 10.). The problem is that setting G11 and G22 equal to zero and G12 to low values, would always result in a density ratio of not more than 2-3. For higher density ratios I have to set a large negative value for G11 (for the outer fluid) and an initial density ratio of minimum 2.0 which has the impact of having a non-pure fluid inside the bubble. Also this leads to inconsistent surface tension values for different bubble radii!!

Any help or idea is greatly appreciated in advance.

Cheers,

Amin

Just like Vikram, I am going to restart the old discussion, as I also share the more or less same pain as he has :)

I have been trying to use SC model for a moderate density ratio static bubble (just up to 10.). The problem is that setting G11 and G22 equal to zero and G12 to low values, would always result in a density ratio of not more than 2-3. For higher density ratios I have to set a large negative value for G11 (for the outer fluid) and an initial density ratio of minimum 2.0 which has the impact of having a non-pure fluid inside the bubble. Also this leads to inconsistent surface tension values for different bubble radii!!

Any help or idea is greatly appreciated in advance.

Cheers,

Amin

Re: Guidance for multicomponent multiphase flow simulation July 10, 2013 06:11AM |
Registered: 6 years ago Posts: 5 |

Hi Amin,

I've been looking over some stuff. So, the Shan Chen Equation of State(EOS) is pretty bad at handling large density ratios. The EOS controls your interaction potential function(psi).

The EOS needs to be changed if you want to handle large density ratios/gradients. From what I understand, this still won't guarantee that it'll work in every case.

There are other methods to handle large density gradients, one of them being the Lee and Lin method. Problem with that one is that you need to have an additional variable/matrix which computes your macroscopic variables like pressure and stuff alongside your particle distribution function (fIn, fOut, feq), which puts a lot of strain on your comp.

And it's also based on the free energy method and not the pseudo-potential method.

I'm still learning, and the equations and concepts are really tough.

I still don't understand how the Equation of State translates to the interaction potential.

Also, thanks for replying. Feels good to know that I'm not the only frustrated guy in the universe with this problem.

I've been looking over some stuff. So, the Shan Chen Equation of State(EOS) is pretty bad at handling large density ratios. The EOS controls your interaction potential function(psi).

The EOS needs to be changed if you want to handle large density ratios/gradients. From what I understand, this still won't guarantee that it'll work in every case.

There are other methods to handle large density gradients, one of them being the Lee and Lin method. Problem with that one is that you need to have an additional variable/matrix which computes your macroscopic variables like pressure and stuff alongside your particle distribution function (fIn, fOut, feq), which puts a lot of strain on your comp.

And it's also based on the free energy method and not the pseudo-potential method.

I'm still learning, and the equations and concepts are really tough.

I still don't understand how the Equation of State translates to the interaction potential.

Also, thanks for replying. Feels good to know that I'm not the only frustrated guy in the universe with this problem.

Re: Guidance for multicomponent multiphase flow simulation September 17, 2013 07:10PM |
Registered: 8 years ago Posts: 3 |

Hi

If anybody has the SCMP, MCMP codes, Please share with me.

my email address is piux66@gmail.com

thank you

If anybody has the SCMP, MCMP codes, Please share with me.

my email address is piux66@gmail.com

thank you

Re: Guidance for multicomponent multiphase flow simulation January 05, 2014 09:43AM |
Registered: 5 years ago Posts: 2 |

Hi

I'm studying on evaluaton of lattice boltzmann models on simulation of multiphase flows.

I simulated some problems by shan and chen method and now I want to simulate them by Free energy method.

I need to have an algorithm or a code to get more familiar with this method.

please help me, if you can.

Thank you.

aminrahmani1990@gmail.com

Edited 1 time(s). Last edit at 01/05/2014 09:46AM by Aminrahmani.

I'm studying on evaluaton of lattice boltzmann models on simulation of multiphase flows.

I simulated some problems by shan and chen method and now I want to simulate them by Free energy method.

I need to have an algorithm or a code to get more familiar with this method.

please help me, if you can.

Thank you.

aminrahmani1990@gmail.com

Edited 1 time(s). Last edit at 01/05/2014 09:46AM by Aminrahmani.

Re: Guidance for multicomponent multiphase flow simulation August 12, 2014 11:21AM |
Registered: 5 years ago Posts: 2 |

Hi everyone, If anybody has the single phase, multicomponent codes, Please share with me.

my email: s.s.mousavi@stu.nit.ac.ir

thanks

my email: s.s.mousavi@stu.nit.ac.ir

thanks

Re: Guidance for multicomponent multiphase flow simulation August 29, 2014 09:01PM |
Registered: 5 years ago Posts: 1 |

Hi everyone,

I am relatively new to the topic and I am trying to use use LBM to simulate single phase and multiphase flow in complex geometry porous media. I am have been doing of reading and playing around with some general codes but I would appreciate some guidance from some anyone who already has codes for SCMP or MCMP.If you would be kind enough to, please share with me.

My email is mfombad@gmail.com

Thanks

I am relatively new to the topic and I am trying to use use LBM to simulate single phase and multiphase flow in complex geometry porous media. I am have been doing of reading and playing around with some general codes but I would appreciate some guidance from some anyone who already has codes for SCMP or MCMP.If you would be kind enough to, please share with me.

My email is mfombad@gmail.com

Thanks

Re: Guidance for multicomponent multiphase flow simulation October 11, 2014 02:36PM |
Registered: 6 years ago Posts: 3 |

Hi all,

I will be grateful if any one can share the single component multphase code and the 2component multiphase LBM code with me.

My email address is donkpams@yahoo.co.uk

Thanks

I will be grateful if any one can share the single component multphase code and the 2component multiphase LBM code with me.

My email address is donkpams@yahoo.co.uk

Thanks

Re: Guidance for multicomponent multiphase flow simulation November 03, 2017 02:58PM |
Registered: 1 year ago Posts: 1 |

Hi everyone,

Please if any of you still has the SCMP and MCMP please can you send me both at anufagbemi24@gmail.com

Your help is greatly appreciated.

Sincerely

Sam

Please if any of you still has the SCMP and MCMP please can you send me both at anufagbemi24@gmail.com

Your help is greatly appreciated.

Sincerely

Sam

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