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Hill region in a double star system (Read 9328 times)
EDG
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Re: Hill region in a double star system
Reply #15 - 03/15/08 at 17:10:44
 
Couldn't be something processor related, could it? Is one of you using INtel and the other AMD or something?
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frankuitaalst
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Re: Hill region in a double star system
Reply #16 - 03/15/08 at 17:38:22
 
Sad Don't know really . I'm using an Intel .  
In fact when I run the sim , and change the velocity , each time the eccentricity increases ... Must be something very stupid I think.
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Tony
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Re: Hill region in a double star system
Reply #17 - 03/16/08 at 08:35:45
 
Try deleting all objects except the 2 stars.  Tell me if it still happens.
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frankuitaalst
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Re: Hill region in a double star system
Reply #18 - 03/16/08 at 10:02:55
 
yes it does happen again . Here is the sim after I deleted the 100 bodies and inversed two times the velocity of the second star .
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Re: Hill region in a double star system
Reply #19 - 03/16/08 at 11:47:29
 
Try this.  Run the before simulation.  Pause the simulation.  Save it. Send that one to me.  Then make the changes.  Don't unpause it.  Save it again and send it to me.  So the two copies I receive should be identical except for the signs.
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frankuitaalst
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Re: Hill region in a double star system
Reply #20 - 03/16/08 at 12:31:50
 
Ok , I'll do so .  
In the meantime I made an output of Vx and Vy ( Output file ) . Each jump corresponds with a change sign . Sim was run at T=1 sec . Output Freq = 1 hour . There are no jumps in Rx or Ry . Ecc and SMA also jump .  
Is it possible that the program keeps running in the time I need to invert the signs ?  
Edit : normally I don't pause the simulation before changing . Can this be my error ?
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frankuitaalst
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Re: Hill region in a double star system
Reply #21 - 03/16/08 at 12:40:47
 
Heres the first sim , before change
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frankuitaalst
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Re: Hill region in a double star system
Reply #22 - 03/16/08 at 12:42:42
 
And this is the second , after changing the sign .  
euh ... I already took a look and noticed that vy is somewhat different from what I expect .
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Tony
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Re: Hill region in a double star system
Reply #23 - 03/16/08 at 12:47:11
 
The simulation pauses when the Edit Objects interface is open.
 
Quote from frankuitaalst on 03/16/08 at 12:40:47:
Heres the first sim , before change

The orbits are eccentric in this one.  Aren't they supposed to be round here?
 
Quote from frankuitaalst on 03/16/08 at 12:42:42:
And this is the second , after changing the sign .
euh ... I already took a look and noticed that vy is somewhat different from what I expect .

They're still eccentric.  They're just travelling in the opposite directions.  This is to be expected.
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frankuitaalst
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Re: Hill region in a double star system
Reply #24 - 03/16/08 at 12:51:24
 
The first copy I sent you already got an eccentricity , coming originally from a circular orbit , after a series of +/- changes.  
Difference with the second is what you asked to do .  
Edit : should I redo this starting from a circular orbit ?  
  
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Tony
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Re: Hill region in a double star system
Reply #25 - 03/16/08 at 15:08:37
 
Yes.  If I understand it correctly, you're starting with circular orbits, changing the signs of star 2 and ending up with eccentric orbits.  What I want is your first simulation with circular orbits and the same simulation after you've made the changes.  But you have to do it Paused.  I don't want any time to elapse between the 1st simulation and the 2nd one.
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