CFD Online Discussion Forums - SetfieldsDict in the multiphaseInterFoam

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SetfieldsDict in the multiphaseInterFoam

Hi, Formers:
It is a problem confused me a lot of days. i want to use the multiphaseInterFoam to stimulate different fluid inject in a cavity sequentially.
If one fluid injection is finished, how can the setfieldsDict be set for the next one?
If the setfieldDict not changed, i have tried this way, the calculation of the next fluid would begin from the end of previous fluid. But the result is not OK.
So, can you give me any advise?

Best regards!

If I understand what you are trying to do, I would say that maybe you need to change the fluid entering the system using a different boundary condition and not setFields. Maybe something like the uniformFixedValue with a time varying uniformValue shown here:

http://www.openfoam.org/version2.1.0...conditions.php

I have not tried this but it is where I would start.

thank u for your reply! Matthew.
i have seen the webpage you recommended. To my issue, the change of u is not
enough, the fluid also be changed. like:First, water; second, oil.

I would think that you could use this BC to change the boundary conditions in your alphaair and alphawater files to change the fluid coming into the domain.

in alphawater:

Code:

 

inlet

{    

        type uniformFixedValue;

        uniformValue     table 

        ( 

            (  0   1.0) 

            (100  0.0) 

        ); 

}

in alphaair:

Code:

 

inlet

{    

        type uniformFixedValue;

        uniformValue     table 

        ( 

            (  0   0.0) 

            (100  1.0) 

        ); 

}

to switch from water to air at t=100.

Like I said, I have never done this but it is where I would start.

Let me know if it works.

sorry to reply you so later, Matthew.
your patient reply is appreciated, thank you! i have done the steps like you say. in my case, there are 3 fluids, two Non-newtonian and one Newtonian. properties file:

Code:

https://www.dropbox.com/sh/i2lrvqxex...properties.jpg.phases         

           (

               oil {

                           transportModel  powerLaw;



                            nu              nu [0 2 -1 0 0 0 0] 1;

                           rho             rho [1 -3 0 0 0 0 0] 748.5;

                              powerLawCoeffs

       {

                k             k [0 2 -1 0 0 0 0] 9.065;

                n             n [0 0 0 0 0 0 0] 0.35;

                nuMin         nuMin [0 2 -1 0 0 0 0] 0.001336;

                nuMax         nuMax [0 2 -1 0 0 0 0] 8.5504342;

        }

   

} 

           mercury {

                             transportModel  powerLaw;



                         nu              nu [0 2 -1 0 0 0 0] 1;

                        rho             rho [1 -3 0 0 0 0 0] 850.5;

                              powerLawCoeffs

       {

                k             k [0 2 -1 0 0 0 0] 7.065;

                n             n [0 0 0 0 0 0 0] 0.25;

                nuMin         nuMin [0 2 -1 0 0 0 0] 0.01336;

                nuMax         nuMax [0 2 -1 0 0 0 0] 7.4504342;

        }

   

}

               air { transportModel Newtonian ; nu nu [ 0 2 -1 0 0 0 0 ] 1.48e-03 ; rho rho [ 1 -3 0 0 0 0 0 ] 1 ; } 



           );



refPhase        air;

And i set the alphaoil and alphamercy like this:https://www.dropbox.com/sh/i2lrvqxex...h:null-oil.jpg oilhttps://www.dropbox.com/sh/i2lrvqxex...h:null-mer.jpg

Code:

 inlet

    {

        type            uniformFixedValue;

        uniformValue    table

        

(

(0 1)

(0.2 0)

)

;

    }

. mer

Code:

inlet

    {

        type            uniformFixedValue;

        uniformValue    table

       (

 

         (0 0)

         (0.2 1)

)

;

the V file:https://www.dropbox.com/sh/i2lrvqxex...#lh:null-v.jpg

Code:

inlet

    {

        type            uniformFixedValue;

        uniformValue    table

        

       (

              (0 (1 0 0))

              (0.2 (0.5 0 0))



        );

    }

. the 3 files are used the new boundrys like you say. But, i felt uncertain about the result (0.2s) :https://www.dropbox.com/sh/i2lrvqxex...E5%9B%BE00.jpg Attachment 26278, the left is the inlet , blue is the air and just the 0.2 second result, i am puzzled about this picture like water-jetting. Does the multiphaseInterFoam solver just for newtonian fluid? By the way, do you know how is the new BC setting as we mentioned in the version 1.6-ext?

https://www.dropbox.com/sh/i2lrvqxex...E5%9B%BE00.jpg
Best regards!
salame