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LPT - Basset Force

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Old   April 3, 2018, 20:33
Default LPT - Basset Force
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Joaquín Neira
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Hello,

I'm working with basicKinematicCollidingCloud and I'm trying to implement a new particle force: the Basset force (along with drag, lift and other forces).

For this purpose I will use this model https://arxiv.org/pdf/1008.0833 (or another one which needs practically the same input parameters. [Computation of the particle Basset force with a fractional-derivative approach])

So, I'm having the following difficulties:
  1. I need to store all the past relative accelerations of the particle for every particle: \frac{dU_r}{dt}=\frac{d(U_p-U_c)}{dt}=\frac{dU_p}{dt}-\frac{dU_c}{dt}.
  2. The tracking algorithm of OpenFOAM modifies the \delta t in every iteration, so the models above becomes invalid or at least not accurate, since they used a fixed \delta t. Is there any way to fix the \delta t of the particle? or a way to modify the models (this requires more numerics knowledge obviously)
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