Search found 1431 matches

by happyjack27
Fri Oct 13, 2017 1:25 am
Forum: News
Topic: EMC2 news
Replies: 305
Views: 41908

Re: EMC2 news

The intent is to test machine scaling. And that is why it runs on thousands of cores on a supercomputer. Wait, so it _was_ run on a thousand cores, or it soon will be? Sounds like maybe scalability has already been tested or at least started to? Speculating here... Sounds like the problem has been ...
by happyjack27
Tue Oct 10, 2017 11:50 pm
Forum: News
Topic: EMC2 news
Replies: 305
Views: 41908

Re: EMC2 news

If all the optimistic comments are true then scalability is a non-issue. So then why was it said that scalability is "next"? Maybe what was really meant is that next is that simulation parameters will be varied to test -machine- scalability as opposed to -algorithm- scalability?!? Two enti...
by happyjack27
Sat Oct 07, 2017 6:11 am
Forum: News
Topic: EMC2 news
Replies: 305
Views: 41908

Re: EMC2 news

The proverbial elephant in the room is the electromagnetic fields from the moving particles.
by happyjack27
Sat Oct 07, 2017 4:56 am
Forum: News
Topic: EMC2 news
Replies: 305
Views: 41908

Re: EMC2 news

You can't do scaling until you have the first principles model figured out. There are some physics going on that were not understood, or to a degree even known. It is a very complex system. You can't have the reprentation of first principles figured out until you have the data structures planned ou...
by happyjack27
Thu Oct 05, 2017 10:30 pm
Forum: News
Topic: EMC2 news
Replies: 305
Views: 41908

Re: EMC2 news

You can't do scaling until you have the first principles model figured out. There are some physics going on that were not understood, or to a degree even known. It is a very complex system. You can't have the reprentation of first principles figured out until you have the data structures planned ou...
by happyjack27
Wed Oct 04, 2017 10:55 pm
Forum: News
Topic: EMC2 news
Replies: 305
Views: 41908

Re: EMC2 news

ladajo wrote:No, not yet. Scaling is next.

I can share that it runs on 1000+ cells when it runs.
I would not say it is horribly inefficient, I would say it is high fidelity and very defendable.


Wait, so then it doesn't use floating point numbers?

Hard to imagine a scenario where scaling isn't first.
by happyjack27
Mon Oct 02, 2017 10:40 pm
Forum: News
Topic: EMC2 news
Replies: 305
Views: 41908

Re: EMC2 news

ladajo wrote:It is First Principles based, and supported by coders and The processing power requirements alone exceed anything realistic folks here have access to for any kind of a timely output on a run. "


Ok so you're telling me the algorithm is horribly inefficient.
by happyjack27
Mon Oct 02, 2017 10:36 pm
Forum: News
Topic: EMC2 news
Replies: 305
Views: 41908

Re: EMC2 news

It is First Principles based, and supported by coders and physicists (International even...) I don't think anything I have seen here over the years can compete. The processing power requirements alone exceed anything realistic folks here have access to for any kind of a timely output on a run. This...
by happyjack27
Mon Oct 02, 2017 4:46 pm
Forum: News
Topic: EMC2 news
Replies: 305
Views: 41908

Re: EMC2 news

ladajo wrote:I can share that the coding effort was collaborative between some of the top minds in the field.


Wait, by top minds do you mean top physicists or top coders?

big difference...
by happyjack27
Mon Oct 02, 2017 4:43 pm
Forum: News
Topic: EMC2 news
Replies: 305
Views: 41908

Re: EMC2 news

You will have to wait. Sorry. I can share that the coding effort was collaborative between some of the top minds in the field. There is nothing else like it right now. It is the cutting edge for plasma sims. :) and proprietary. Then I bet it uses my distributed dynamic octree idea for massive scala...
by happyjack27
Mon Oct 02, 2017 2:05 am
Forum: News
Topic: SpaceX News
Replies: 1999
Views: 194538

Re: SpaceX News

Another thing to consider is that a rocket's velocity at a given altitude is optimized for maximum fuel efficiency, considering the air pressure and thus friction. Basically it goes as fast as it can so long as that's below terminal velocity. The available thrust-to-weight ratio can then be taken in...
by happyjack27
Sun Oct 01, 2017 4:54 pm
Forum: News
Topic: SpaceX News
Replies: 1999
Views: 194538

Re: SpaceX News

if we compare BFR to traditional airline, all things being equal, the primary costs per passenger are fuel and maintenance. if we set maintenance equal, we're down to fuel costs. and now one can see that BFR saves fuel over an airline by going to a higher altitude and thus less air friction. however...
by happyjack27
Sun Oct 01, 2017 4:19 pm
Forum: Theory
Topic: Adaptive Grid for simulations
Replies: 1
Views: 9433

Re: Adaptive Grid for simulations

also similar are the fast-multipole method https://en.wikipedia.org/wiki/Fast_multipole_method and a variation i wrote based on oct-trees ( https://en.wikipedia.org/wiki/Octree ) with dynamic depth. https://sourceforge.net/projects/octreemethodforparticles/ they all attempt to reduce the o(n x n) al...
by happyjack27
Sun Oct 01, 2017 3:56 pm
Forum: News
Topic: EMC2 news
Replies: 305
Views: 41908

Re: EMC2 news

Yes, I would say it is the most advanced 3D particle plasma sim out there. Part of the work has been to create the software. It runs on a multi-cell super computer. The outputs are impressive (and pretty). Explain to me the algorithm, please? Is it an all-pairs method? If so, does it use fast multi...

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