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How solution is initialized?

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Old   November 25, 2014, 18:42
Default How solution is initialized?
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Chintan Patel
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Does SU2 initializes velocity to zero or it incorporates free stream conditions to initialize solution?

If not zero, is there a way to change that?
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Old   November 26, 2014, 04:50
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Sachchit Vekaria
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Hi,

It will use free stream(farfield) conditions to initialize the solution. May I know why you would like to change it zero with non-zero freestream condition?
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Old   November 26, 2014, 13:23
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Quote:
Originally Posted by Sachchit View Post
Hi,

It will use free stream(farfield) conditions to initialize the solution. May I know why you would like to change it zero with non-zero freestream condition?
Hi Sachchit,
Thanks for reply.

I have two inlets and both have velocities in orthogonal direction Having initialization orthogonal to inlet velocity in one duct either slows down convergence or diverges. FMRES blew up and BICGSTAB takes roughly more than thrice the time per iteration compared to FMRES). This isn't desired as I have mesh with more than 11M cells.

Starting with zero velocity everywhere is best bet for my case. It would be great if someone could point me how to modify code. Thanks.
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Old   November 26, 2014, 14:01
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Sachchit Vekaria
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Hi Chintan,

What you can do is set the farfield mach number to be 0. And then define both the inlet as velocity inlet and assign other patches to be pressure outlet except walls.

One other way which might be helpful is to develop the solution with only one inlet on and then after reaching steady state restart the solution with both the inlets on.
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Old   November 26, 2014, 14:09
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Quote:
Originally Posted by Sachchit View Post
Hi Chintan,

What you can do is set the farfield mach number to be 0. And then define both the inlet as velocity inlet and assign other patches to be pressure outlet except walls.

One other way which might be helpful is to develop the solution with only one inlet on and then after reaching steady state restart the solution with both the inlets on.
That's very helpful. Thanks a lot.
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