Charles Xie

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  • in reply to: Solar energy flux simulation #306

    Charles Xie
    Keymaster

    Unfortunately, I haven’t got time to write documentations and tutorials. Hopefully, I will be able to do those in the future.

    in reply to: Defining direction of gravity in a model #305

    Charles Xie
    Keymaster

    When you right-click on the view and open Model Properties, you can set the gravitational acceleration in the Particle tab. If you set it to 9.8 m/s^2, then you model the vertical situation. If you set it to 0, then you model the horizontal situation. Any other value can correspond to other planets or within a spaceship.

    in reply to: Surface Mount Resistor Modeling #302

    Charles Xie
    Keymaster

    This is not an easy question to answer. Not every 3D problem can be reduced to a 2D model. It is basically a case-by-case thing.

    in reply to: scrolling through the model #300

    Charles Xie
    Keymaster

    Sorry, you can’t.

    in reply to: installation on linux #298

    Charles Xie
    Keymaster

    If you failed in installing it on Linux, try to download the Raspberry Pi package and unzip it. And then run the energy2d.jar file.

    in reply to: simulation on small size models #295

    Charles Xie
    Keymaster

    Yes, you can. Just set the dimension of the simulation box to the micro meter scale. See the attached screenshot. Don’t forget to also reduce the time step. A smaller time step is required for a smaller length scale.

    • This reply was modified 1 month, 2 weeks ago by  Charles Xie.
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    in reply to: Solar energy flux simulation #292

    Charles Xie
    Keymaster

    The ray simulation in Energy2D is meant to be educational. Use it only if you are looking for qualitative results. Hope this helps.

    in reply to: scaling up the Solar Updraft Tower #283

    Charles Xie
    Keymaster

    Thanks for your interest in Energy2D. The simulation depends also on the boundary. A flow that is stable in a small box may not be in a large box, vice versa. I will take a further look once I get some free time.

    in reply to: Simulation of foam insulated hot water pipe system #273

    Charles Xie
    Keymaster

    Hi Guy:

    I looked at your model and I don’t know what is wrong. Can you elaborate?

    Thanks,
    Charles

    in reply to: Minimum dimension #266

    Charles Xie
    Keymaster

    Many users have requested supporting a material library. Unfortunately, I have very limited time and I am maintaining this software in my spare time. It is not funded by anyone since about five years ago.

    Hopefully it will continue to exist.


    Charles Xie
    Keymaster

    I can reproduce your problems. Not sure if this is caused by a huge distortion of the grid cells (400 times larger in the horizontal direction than in the vertical direction). I will keep looking.

    in reply to: Minimum dimension #263

    Charles Xie
    Keymaster

    Expanding the grid size would cause the simulation to slow down by N^2. So this is currently locked. But I agree there should be such an option in the future.

    in reply to: Minimum dimension #261

    Charles Xie
    Keymaster

    That is right. Since the computational grid is 100×100, you can’t set the size of a component below 1/100th of the size of the window. If you could, it would be ignored by the engine.

    in reply to: Minimum dimension #257

    Charles Xie
    Keymaster

    PS: Don’t forget to set the time step to be small to be compatible with the micron scale. Otherwise you will get a fatal error.

    in reply to: Minimum dimension #255

    Charles Xie
    Keymaster

    This is done. See the attached image.

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