# guidelines on time step

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 February 3, 2004, 21:36 guidelines on time step #1 Effendi Ali Guest   Posts: n/a hi all, to be straight to the point, my simulation is about boiling. i have problem on deciding the correct time step, since different time step will vary the simulation result (although on the same flow time) example: 1 time step of 1s 10 time step of 0.1s 100 time step of 0.01s and 1000 time step of 0.001s all of it will generate different result please enlighten me thanks you in advance

 February 4, 2004, 03:41 Re: guidelines on time step #2 mateus Guest   Posts: n/a Hi! Do all simulations converge? In principle the right time step should be about 100 times smaller then the (1/igenfrequency) of the phenomenon. At least that's my experience... Check out the courant number also.. regards MATEUS

 February 4, 2004, 07:15 Re: guidelines on time step #3 prasanth Guest   Posts: n/a hai Ali and mateus, I am also facing the same problem. mateus, yeah for some time steps it will converge. some cases wont. according to you, how to calculate courant number for two-phase problem? I kknow general formula for courant number.' thnks and rgds prasanth

 February 4, 2004, 08:50 Re: guidelines on time step #4 Effendi Ali Guest   Posts: n/a thanx for your response mateus and prasanth yes it is converge for every single time step (i make sure there are enough iterations per time step)

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