Time step size

sreenivas · July 27, 2010, 03:00

Hi

Can any body explain me what exactly the time step size in star-ccm means and how it is related to physical time.First time i am simulating transient heat transfer process.

Thanks in advance
srinivas

bengy · July 27, 2010, 04:00

hello,

time step x number of time step = physical time

regards

sreenivas · July 27, 2010, 04:34

Hi Bengy
Thanks for the reply.But my question is what is the time step exactly means?

Thanks

bengy · July 27, 2010, 05:08

hi,

but you also asked how it is related to physical time

regards

sreenivas · July 27, 2010, 08:43

Y aur true but my primary interest is to know what exactly time step physically means

Thanks

Maddin · July 31, 2010, 11:25

Courant number, look at this and you will understand how to chose the time step.
Maybe I'm wrong but I think one timestep is like a steady run of the simulation with the boundary conditions which you have at this time.

bengy · July 31, 2010, 15:55

correct me if I wrong, but I think that we have to choose time step that courant number is < 7 ( or even 10 - max).

regards

Maddin · July 31, 2010, 16:30

Lower 1 or when some mesh cells are not good (typical ccm mesh

) you have to check the other scalars.

July 27, 2010, 03:00	Time step size	#1
sreenivas New Member sreenivas Join Date: Jul 2010 Posts: 23 Rep Power: 15	Hi Can any body explain me what exactly the time step size in star-ccm means and how it is related to physical time.First time i am simulating transient heat transfer process. Thanks in advance srinivas

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July 27, 2010, 04:00		#2
bengy New Member Join Date: Jul 2010 Posts: 29 Rep Power: 15	hello, time step x number of time step = physical time regards

July 27, 2010, 04:34		#3
sreenivas New Member sreenivas Join Date: Jul 2010 Posts: 23 Rep Power: 15	Hi Bengy Thanks for the reply.But my question is what is the time step exactly means? Thanks

July 27, 2010, 05:08		#4
bengy New Member Join Date: Jul 2010 Posts: 29 Rep Power: 15	hi, but you also asked how it is related to physical time regards

July 27, 2010, 08:43		#5
sreenivas New Member sreenivas Join Date: Jul 2010 Posts: 23 Rep Power: 15	Y aur true but my primary interest is to know what exactly time step physically means Thanks

July 31, 2010, 11:25		#6
Maddin Senior Member Join Date: Mar 2009 Posts: 260 Rep Power: 18	Courant number, look at this and you will understand how to chose the time step. Maybe I'm wrong but I think one timestep is like a steady run of the simulation with the boundary conditions which you have at this time.

July 31, 2010, 15:55		#7
bengy New Member Join Date: Jul 2010 Posts: 29 Rep Power: 15	correct me if I wrong, but I think that we have to choose time step that courant number is < 7 ( or even 10 - max). regards

July 31, 2010, 16:30		#8
Maddin Senior Member Join Date: Mar 2009 Posts: 260 Rep Power: 18	Lower 1 or when some mesh cells are not good (typical ccm mesh ) you have to check the other scalars.