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Alex

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Viewing 8 posts - 1 through 8 (of 8 total)
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  • December 9, 2022 at 12:12 pm in reply to: Lattice and physical times #7067
    Alex
    Participant

    Dear Prof. Mathias,

    Many thanks for your hint. I do not use OpenLB, so i will take a look at the book you mentioned.

    kind regards,
    Alex

    June 3, 2022 at 4:02 am in reply to: Gallium melt flow #6612
    Alex
    Participant

    Dear Julius,

    Many thanks for the link!

    kind regards,
    Alex

    June 3, 2022 at 4:02 am in reply to: Gallium melt flow #6611
    Alex
    Participant

    Dear Prof. Mathias,

    Thank you for the link!

    kind regards,
    Alex

    June 2, 2022 at 6:41 am in reply to: Gallium melt flow #6602
    Alex
    Participant

    Unfortunately, i could not find the thesis of Dr. Gaedtke. But I found the paper of his with the TRT model for gallium and parafin melting. However, the low Pr treatment is not discussed in this work. If someone encounteres the same problem, you can refer to the work of Bawazeer et. al. [https://doi.org/10.1016/j.ijheatmasstransfer.2019.118562]. The authors added a correction term to the force term in order to make the model stable with low Prandtl numbers.

    May 21, 2022 at 6:01 am in reply to: Gallium melt flow #6579
    Alex
    Participant

    Many thanks. I have found that the problem of low and high Pr flow simulation via LBM is partially discussed in [https://doi.org/10.3390/fluids6040148]. As Prof. Mathias noted, relaxation time needs to be non-uniformly treated for the grid points.

    May 20, 2022 at 11:50 am in reply to: Gallium melt flow #6577
    Alex
    Participant

    Dear Prof. Mathias,

    Many thanks for your hints. Grid size variation has no effect on stability. I thought about to capture the moment when crucial error occurs. But what I should do next I don’t know since, for example, in BGK model relaxation time is constant all over the domain. An interesting note that when I apply magnetic field with high Hartmann number, code becomes stable.
    kind regards,
    Alex

    June 8, 2021 at 5:47 am in reply to: Stability of 3D thermal LBM model #5716
    Alex
    Participant

    Dear Dr. Gaedtke,

    Thank you for your response. I strongly agree that turbulence is a 3D process. However, in the case of the differentially heated cavity 2D model is also fine as the first approximation which gives similar patterns to 3D.
    I am trying to perform a pseudo-direct numerical simulation to make the model free from empirical constants. What concerns LES, Smagorinsky model works fine in 3D. But Cs significantly affects both the results and numerical stability. BTW, when I did the literature review I read the paper you mentioned

    kind regards,
    Alex

    March 20, 2019 at 5:19 am in reply to: D2Q9 TRT Lid driven cavity flow #4170
    Alex
    Participant

    Hello Stephan,

    Thank you! I will try it

    kind regards,
    Alex

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Viewing 8 posts - 1 through 8 (of 8 total)