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Steady state run - inner cycle

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Old   June 12, 2024, 04:55
Default Steady state run - inner cycle
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Giovanni Bettega
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Hello,

A steady state run: TIME_DOMAIN=NO

(only inner loops)

There is and option in the configuration file:

TIME_DISCRE_FLOW

which can be

1) EULER_IMPLICIT
2) EULER_EXPLICIT
3) RUNGE_KUTTA_EXPLICIT

(In the config template I found

% Time discretization (RUNGE-KUTTA_EXPLICIT, EULER_IMPLICIT, EULER_EXPLICIT)
TIME_DISCRE_FLOW= EULER_IMPLICIT

)

About the explicit options, and in particular
about the option 2), is there the possibility of
setting directly a "time step" for that explicit approach?
Or the "time step" is always local, based on CFL number?
Thanks a lot

Giovanni

Last edited by gbettega; June 12, 2024 at 11:42.
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Old   June 13, 2024, 17:53
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bigfoot
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We have some examples of unsteady simulations in the testcases folder, for instance the flow a square cylinder in TestCases/Unsteady/square_cylinder, you basically do:

Code:
TIME_DOMAIN = YES
TIME_MARCHING= DUAL_TIME_STEPPING-2ND_ORDER
TIME_STEP= 0.0015
MAX_TIME= 3.75
% 2500 iterations - 3.75
% 3500 iterations - 5.25
% 5000 iterations - 7.50
%
INNER_ITER= 10
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Old   June 13, 2024, 19:39
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Giovanni Bettega
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Thanks
my question was about a steady state run
Giovanni
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steady state run, time advancement

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