Formation of a solar system

www.greenleaf.dk/projects

A Smoothed Particle Hydrodynamics SPH simulation of the formation of a solar system or a planetary system.

The calculations were at 31 FPS for 3000 particles.

Initially the particles have a turbulent position and velocity and a somewhat high concentration near the center. This high density generates high presure which explodes the system outwards.

In the center there is a gravity source which pulls the particles back in and eventualy a large central body and a number of smaller orbiting bodies forms.

The interesting thing is that as the larger of the orbiting bodies (planets or moons depending on your scale) will start to get a locked rotation (tidal lock) meaning that they will keep one side towards the center of rotation and that their rotational period is equal to their orbiting period. Just as our own moon.
This can be seen from the 1:50 minute mark.

As the larger orbiting body starts to grow in size, it will fall inside the Roche Limit and it will break up.
The breakup happens arround 2:30 minutes in.
The reason it breaks up it in few words that the different parts of the body wants to rotate at different velocities arround the central body. The larger the orbiting body becomes, the larger the desired velocity difference is.

Category:

Science & Technology

Tags:

• SPH
• smoothed
• particle
• hydrodynamics
• astronomy
• physics
• simulation
• sun
• planet
• moon

[DKM101]

Very nice. It seems kind of odd tho that the giant blob should stay centered throughout the whole simulation... Is the camera at a center-of-mass view? are there other forces? Or am i just wondering about nothing...

[joetaicoon]

@DKM101

You make a good point. The simulation, you are commenting on, is one of the very earliest adaptions of my original 2D "water in a box" simulations, and it does have artificial gravity towards the scene center.

[shutup735]

Is this some sort of simulation program? is so where can i get it? if not is there anything like this that i can get?

[joetaicoon]

@shutup735 It is a simlator written by myself in c# as a project for my masters degree in computer science. I beleive most, if not all, other SPH code on youtube is home written as well. See link in description (I can't write it in this comment it seems) for a way to the pdf document describing this in details.

Hmm.. just noted the previous comment which I responded to with more or less the same words. Is it not vissible for others any longer?

[abbs219]

that is a very cool animation

it was also interesting watching the smaller bodies get a "slingshot" from the larger ones

what program was used?

[joetaicoon]

Thanks for the comment.

This is a demo of my own code which implements "smoothed particle hydrodynamics" simulation and n-body gravity.

[theepicnub1]

trippy