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mathias

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  • April 25, 2017 at 6:52 am in reply to: PROBLEM uMax #2612
    mathias
    Keymaster

    From experience, thats it. Best Mathias

    April 24, 2017 at 5:39 pm in reply to: PROBLEM uMax #2610
    mathias
    Keymaster

    That basically means that the simulation tuned close to unstable. In such cases the results are not really reliable. THerefore we add this code to stop the simulation.

    Best
    Mathias

    April 20, 2017 at 7:52 am in reply to: High Re Flows Calculation Fault #2608
    mathias
    Keymaster

    Periodic BC might be more stable. We also have free outflow conditions. Please have a look in the dogygen documentation. It is called “convection” BC and simular to the one paper of Junk form Konstanz.

    Best
    Mathias

    April 19, 2017 at 5:55 pm in reply to: Hi all #2606
    mathias
    Keymaster

    These parameteres depend on your actual geometry, so they come from outside!

    April 19, 2017 at 5:02 pm in reply to: Hi all #2604
    mathias
    Keymaster

    It looks like they are incorrect!

    April 18, 2017 at 7:25 pm in reply to: Hi all #2594
    mathias
    Keymaster

    Hi lbmcoding,

    you can extend the source code by your functor. I recomment to copy an existing similar one. You are also welcome to email as the code to include in the next version of OpenLB.

    Best
    Mathias

    April 13, 2017 at 9:54 am in reply to: help me ! #2591
    mathias
    Keymaster

    You actually can use any BC you want. For Bouzidi, the chance is not really complicated. Please, look at cylinder3d or our aorta3d example.

    Best
    mathias

    April 13, 2017 at 8:44 am in reply to: fluid property #2589
    mathias
    Keymaster

    Have a look here, https://en.wikipedia.org/wiki/Reynolds_number . Changing the charRho will just change the result by the some constant. For the calculation of Re, it does not matter since it is already included in the kinematic viscosity charNu! BEst Mathias

    April 13, 2017 at 8:41 am in reply to: help me ! #2588
    mathias
    Keymaster

    If the roting system is symmetric, yes. Then only the BC needs to be chanced and a force term needs to be add. That is right. Yes, and for Bouzidi we have a velocity term included.

    Best
    Mathias

    April 12, 2017 at 11:22 pm in reply to: help me ! #2585
    mathias
    Keymaster

    For a rotaing cylinder you just need to change the boundary conditon but we also have a cylinder coordinate system implementation. For it please check out the code in frameChange* .

    Best
    Mathias

    April 12, 2017 at 11:20 pm in reply to: fluid property #2584
    mathias
    Keymaster

    You only need to change the viscosity such that the Reynolds number ist fine in the end. Best Mathias

    April 12, 2017 at 10:37 am in reply to: Smooth start curve in aorta3d #2582
    mathias
    Keymaster

    Please, have a look at our various examples, e.g. cylinder3d/2d, as well as please consider to come to our next Spring School in Karlsruhe next year.

    Best
    Mathias

    April 12, 2017 at 9:46 am in reply to: Smooth start curve in aorta3d #2580
    mathias
    Keymaster

    In the simulation you need to set the e.g. the velocity in lattice units. Best Mathias

    April 12, 2017 at 8:58 am in reply to: User Guide not on par with OpenLB Version #2578
    mathias
    Keymaster

    Yes, you are right – it has been replaced. The new approach is much more flexible. You can further write e.g. gifs. On the website there is a little log about new features.

    Best
    Mathias

    April 12, 2017 at 8:53 am in reply to: Smooth start curve in aorta3d #2577
    mathias
    Keymaster

    This is avoid pressure waves, i.e. to obtain a consistant initial condition. There are also other ways of doing it and some papers, too.

    Best
    Mathias

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