GSim 0.32.01 - 0.32.06
Posted: Thu Sep 22, 2016 3:50 pm
A small (but important!) update to the gravity sim...
GSim 0.32.01
Changed:
-Added in elliptical trails, so that you see an object's full orbit instead of just a trail. Still fairly beta, so feedback on it welcome
-Improved the relativistic calculations (wow, I spent a lot of time learning waaaay more than I thought I'd need to)
-Added instructions panel
-Gave the screen some momentum when you slide it around
-Renamed "Lagrange" button to "Follow Both (rotating frame)", to be a bit clearer. Eventually I'd like to add the lagrange points themselves
-Lots of bug fixes
On the relativistic calculations, I'll spare you all the details, but note that the 'problem' with conservation of momentum isn't, I believe, a problem at all. I rebuilt the whole system multiple times, going through with a fine-tooth comb... and I did indeed find some bugs in it. So now relativity is working a lot better. You can now, for instance, do 'circular' orbits around moving black holes... which get compressed into oval orbits. You can also get a lot closer to the speed of light, as objects now use a momentum variable instead of a velocity variable (which eliminates some floating point error issues).
Ah, sorry, I said I'd spare the details.
Back to the conservation of momentum issue -- I believe what's happening is that some momentum is going into the gravitational field itself. Just like how in electromagnetism, the field can carry momentum (as in, photons flying away from the charged particles), the same can happen in gravity. And I didn't realize that the simulation I built actually contained gravitational waves, but I guess it does! So the change in momentum that you notice is in fact due to gravitational waves.
Weird!
To Do:
(Nuts-and-Bolts)
-Better SFX
(Menus)
-More Science Equipment (protractor, etc)
(Sim Additions / Overlays)
-Polar Grid, Apsis view, eclipses (viewtopic.php?f=7&t=156&start=140#p2937)
-Inertial Mass != Gravitational Mass? (viewtopic.php?f=7&t=156&start=160#p3281)
(Under Discussion)
-Changing Newton's Laws (viewtopic.php?f=7&t=156&start=160#p3281)
-Use dr/dt as a variable in force law (viewtopic.php?f=7&t=156&start=170#p3455)
GSim 0.32.01
Changed:
-Added in elliptical trails, so that you see an object's full orbit instead of just a trail. Still fairly beta, so feedback on it welcome
-Improved the relativistic calculations (wow, I spent a lot of time learning waaaay more than I thought I'd need to)
-Added instructions panel
-Gave the screen some momentum when you slide it around
-Renamed "Lagrange" button to "Follow Both (rotating frame)", to be a bit clearer. Eventually I'd like to add the lagrange points themselves
-Lots of bug fixes
On the relativistic calculations, I'll spare you all the details, but note that the 'problem' with conservation of momentum isn't, I believe, a problem at all. I rebuilt the whole system multiple times, going through with a fine-tooth comb... and I did indeed find some bugs in it. So now relativity is working a lot better. You can now, for instance, do 'circular' orbits around moving black holes... which get compressed into oval orbits. You can also get a lot closer to the speed of light, as objects now use a momentum variable instead of a velocity variable (which eliminates some floating point error issues).
Ah, sorry, I said I'd spare the details.
Back to the conservation of momentum issue -- I believe what's happening is that some momentum is going into the gravitational field itself. Just like how in electromagnetism, the field can carry momentum (as in, photons flying away from the charged particles), the same can happen in gravity. And I didn't realize that the simulation I built actually contained gravitational waves, but I guess it does! So the change in momentum that you notice is in fact due to gravitational waves.
Weird!
To Do:
(Nuts-and-Bolts)
-Better SFX
(Menus)
-More Science Equipment (protractor, etc)
(Sim Additions / Overlays)
-Polar Grid, Apsis view, eclipses (viewtopic.php?f=7&t=156&start=140#p2937)
-Inertial Mass != Gravitational Mass? (viewtopic.php?f=7&t=156&start=160#p3281)
(Under Discussion)
-Changing Newton's Laws (viewtopic.php?f=7&t=156&start=160#p3281)
-Use dr/dt as a variable in force law (viewtopic.php?f=7&t=156&start=170#p3455)