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Lubrication correction

OpenLB – Open Source Lattice Boltzmann Code › Forums › on OpenLB › General Topics › Lubrication correction

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  • June 4, 2020 at 7:31 am #5014
    nimmi
    Participant

    Dear All,

    Is lubrication approximation for fluid flow is implemented in OpenLB? I actually could’nt find it? If not done yet please suggest me something how I can approach it?
    Thanks is advance.

    Best Regards,
    Nimmi

    June 4, 2020 at 9:32 am #5015
    robin.trunk
    Keymaster

    Dear Nimmi,

    a lubrication approximation is currently not implemented. I assume you mean a lubrication approcimation for thin fluid layers. Do you have s specific LBM approach or paper in mind?
    As those cases are not described by standard Navier-Stokes anymore you will probably have to create a new dynamics object in OpenLB to modify the LBM collision step.

    Best regards
    Robin

    June 4, 2020 at 2:51 pm #5017
    nimmi
    Participant

    Thanks Robin for your response.

    What you assumed is definitely correct. No, I don’t have any paper or approach in mind. I was just wondering whether it is a good idea to use lubrication approximation in place of solving the actual problem without any approximation.
    Navier-Stokes is a non-linear equation and hence difficult to solve for two or three dimensions without the approximation. But this is not the case with LBM (its part of the computer to do the calculation). So, Do you think its really a good idea to go for approximation?
    Thanks.

    Best regards
    Nimmi

    June 4, 2020 at 9:48 pm #5018
    robin.trunk
    Keymaster

    Dear Nimmi,

    I’m not too familiar with the simulation of thin fluid layers, but it probably depends on the case you are trying to simulate. In this paper (10.1016/j.camwa.2007.08.013) the flow over a curved surface in lubrication is investigated with basic LBM regarding the velocity profile.
    If you are asking whether it is feasible to resolve a thin fluid layer it depends on the size of your domain and your computational power at hand.

    Best regards
    Robin

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