Timeline for Lattice Boltzmann Method: How is shear flow handled in D2Q5?
Current License: CC BY-SA 4.0
15 events
| when toggle format | what | by | license | comment | |
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| Aug 11, 2020 at 10:47 | vote | accept | Lenny | ||
| Aug 10, 2020 at 0:22 | answer | added | 2b-t | timeline score: 1 | |
| Aug 9, 2020 at 22:07 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Aug 3, 2020 at 20:00 | comment | added | 2b-t | @Lenny Don't worry, I will give you a longer and more detailed answer tomorrow. I would not recommend reading papers for getting familiar with any new topic: Publications are intended to be more like an open discussion between people that more or less familiar with the key aspects rather than introducing people unfamiliar with the basics. In my opinion there is only a single good book available on the topic by Krüger et al.. | |
| Aug 2, 2020 at 14:08 | comment | added | Lenny | Thank you very much 2b-t. it makes intuitive sense to me what you say. unfortunately it was never stated that clearly in any papers i've seen, so thank you for clarifying... I'd take your comment as answer, but I think this is not possible. :/ | |
| Aug 1, 2020 at 1:15 | comment | added | 2b-t | Therefore the requirements for the lattice discretisation increase, a D2Q5 suffices for scalar advection-diffusion, but for incompressible fluid flow you will need a D2Q9 and for fully compressible simulations you generally will need a very high number of discretisation speeds (multi-speed lattices such as a D2Q37). If you are still interested I can take my time and try to give you a more complete answer. Sorry I did not see your question some month earlier. | |
| Aug 1, 2020 at 1:09 | comment | added | 2b-t | Hey Lenny, the answer whn has given you is wrong. You simply can't simulate fluid flow with a D2Q5 lattice, but you can use it to simulate advection-diffusion of scalars. In LBM the number of velocities can't be chosen arbitrarily - it is connected to the conserved quantities: A simple diffusion equation requires the amount of substance to be conserved, an incompressible simulation requires the conservation of mass and momentum and a thermal/compressible simulation additionally conservation of energy. | |
| Oct 15, 2019 at 15:00 | history | tweeted | twitter.com/StackPhysics/status/1184121767134146561 | ||
| Oct 10, 2019 at 15:18 | answer | added | Krupip | timeline score: 0 | |
| Oct 10, 2019 at 14:38 | comment | added | Krupip | also looks like your equilibrium step needs to be changed for d2Q5, ie, the probability of water moving up and colliding with other particles causing perpendicular flow is not zero, where it looks like there is zero perpendicular flow happening in your D2Q5 version. | |
| Oct 10, 2019 at 14:36 | comment | added | Krupip | Physicists won't be able to answer this easily, consider asking an altered version of this question on scicomp.stackexchange.com. | |
| Sep 30, 2019 at 10:52 | history | edited | Lenny | CC BY-SA 4.0 |
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| Sep 30, 2019 at 9:29 | history | edited | Lenny | CC BY-SA 4.0 |
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| Sep 30, 2019 at 9:20 | review | First posts | |||
| Sep 30, 2019 at 11:08 | |||||
| Sep 30, 2019 at 9:15 | history | asked | Lenny | CC BY-SA 4.0 |