@KyleKanos Is there a standard way or program to give a triangulation of the dicretization of space? How can you specify the region with more points? I don't really understand this so I never try to use FVM
The idea is that you don't want to run a 5000x5000 simulation because it will just waste computing time in the regions where nothing is really happening
> When we look at subsonic flow, the gas speeds up as the area decreases and slows down as the area increases. This is the traditional Venturi effect. However, when the flow is supersonic, the opposite happens. The flow accelerates as the area increases and slows as it decreases.
@hwlau AFAIK, AMR should be useful for any partial differential equation. Usually one of the fluid variables (density or pressure really) are chosen as the error check with discrepancies larger than say 0.02 between the two cells flagging it for refinement.
I've never actually programmed an AMR engine in any dimension, just taken what other people have done. I have done a SMR (Statis Mesh Refinement) which is where only a certain region is refined and the solution is smoothed onto the coarse solution.
I've been thinking of throwing that one up on github, but I've been lazy
@hwlau Yes, no answers on SciComp because most of the answerers use the FEM method
The Riemannium atom? Is it possibly real or does it not abide to certain conditions for existence?
user54412
6:21 PM
@dmckee If I see a user profile that says "Please delete me" should I inform the mods? (maybe the user forgot to notify someone through the proper channels)
@jinawee Sure, but the answer is going to be massively complicated by competition from the rotation of the planet. Maybe a really big Foucault pendulum at the rotational pole, but protecting it against noise and backgrounds for months is not going to be easy.
@ChrisWhite According to physics.stackexchange.com/help/deleting-account they are suppose to also use the contact link to bring it to the attention of the team. We can't kill most accounts.
On the pendulum...would the equator be better. One involves subtracting of the daily rotation.
user54412
@dmckee ok, so it's a team thing, not a mod thing
user54412
it's weird, I found an account like this, but the user posted a question a few minutes ago
user54412
@GlenTheUdderboat you're going to have to define Riemannium - I've never heard of it
Simple as that.
I think that since we can only upvote comments, it leads to skew, where comments, even if they are unhelpful or inaccurate cannot be downvoted.
Given that the whole mechanics of this website is, more-or-less "people vote for things and the good things rise to the top, while the ...
@ChrisWhite yeah, I think we know about one case. Anyway, it never hurts to bring it to moderators' attention, but it's not really something we can deal with.
We've previously had some discussion about the suitability of pure math questions for this site. Currently, pure math questions - by which I mean those that have no physics content, even if they arise in a physical context - are off topic. We migrate those to Mathematics. Here are some recent exa...
@KyleKanos I know now that why people usually use finite different because it can be easily written from scratch. In particular when you get new differential equations. The AMR is hard to implement and it costs months to make it correct.
So, do you mean that I only need to give the relation between different nearest neighbour gird point, and the AMR engines will calculate other things for me? Is it the reason you think that the method can be used for all partial differential equation?
@dimension10 I noticed you have a "fake" Sklivvz over at PO. Can you please delete the user and only leave the attribution on posts/comments (unless you want to remove them as well, but that's up to you).