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Is lift force included by default in mppiccloud?

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Old   January 14, 2025, 15:29
Default Is lift force included by default in mppiccloud?
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Hello, this must be something very simple but I am lost reading the api description, the question is, is the LiftForce included by default in the particleForces for mppiccloud? I am using of12. I checked the tutorials and all of them include at the most drag and gravity. Thanks a lot.
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Old   January 15, 2025, 15:36
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Ok there is no default lift force, I followed some other posts, and arrived to these dictionaries modifications in cloudProperties:
Code:
    
interpolationSchemes
    {
        rho.air         cell;
        U.air           cellPointWallModified;
        mu.air          cell;
        alpha.air       cell;
        curlUcDt        cell; //<- this
   }
and
Code:
    particleForces
    {
        ErgunWenYuDrag
        {
            alphac alpha.air;
        }
         gravity;
       //this ->

         SaffmanMeiLiftForce
        {
            U    U.air;
        }
    }
to add the SaffmanMeiLiftForce. This runs as longer as there are no particles in the domain, as soon as particles enter, it crushes with the error:
Code:
--> FOAM FATAL ERROR: 
Carrier phase curlUc interpolation object not set
I thought I was setting the interpolation object by giving the interpolation scheme of curlUcDt with the code above but it seems not. Does anybody know how I should set the object?
Thanks a lot
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Old   January 15, 2025, 16:36
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You probably need to define curlUc instead of curlUcDt in interpolationSchemes.
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Old   January 15, 2025, 16:47
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Quote:
Originally Posted by dscian View Post
You probably need to define curlUc instead of curlUcDt in interpolationSchemes.
I have tried that in several ways I still get the same fatal error
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Old   January 16, 2025, 09:46
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Quote:
Originally Posted by IsAv View Post
Ok there is no default lift force
Ok I am going back may be, there is a LiftForce that calculates (from LiftForce.C):
Code:
     forceSuSp value(Zero, 0.0); 
     const vector curlUc =
         curlUcInterp().interpolate
          (
              p.coordinates(),
              p.currentTetIndices(td.mesh)
          );
 scalar Cl = this->Cl(p, td, curlUc, Re, muc);
value.Su() = mass/p.rho()*td.rhoc()*Cl*((td.Uc() - p.U())^curlUc)
to which the TomoyamaLift and SaffmanMeiLift contribute, I am prone to think that LiftForce is there by default since it is not offered as an option by ParticleForces but still not sure. I don't what Cl is so I can not confirm, it is defined with value zero in LiftForce.C:
Code:
 Foam::scalar Foam::LiftForce<CloudType>::LiftForce::Cl
  (
      const typename CloudType::parcelType& p,
      const typename CloudType::parcelType::trackingData& td,
      const vector& curlUc,
      const scalar Re,
      const scalar muc
  ) const
  {
      // dummy
      return 0.0;
  }
So the LiftForce is zero? How could I confirm that the lift is there?
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