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Lift over Drag Racio

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Old   April 6, 2018, 06:47
Question Lift over Drag Racio
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João Lourenço
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Hi everyone,

I would like to know if it is possible to performed in SU2 an objective function that optimize a lift-to-drag ratio.If it is what is the name of configure option.

Thanks,
João Lourenço
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Old   April 15, 2018, 19:12
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tom pratt
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João,
look at the options at the bottom of the config_template.cfg file.
you can use the option OPT_OBJECTIVE to define the objective for your optimisation.
you can use the same options listed for either objective or constraints, e.g:
Code:
% Available flow based objective functions or constraint functions
%    DRAG, LIFT, SIDEFORCE, EFFICIENCY,
%    FORCE_X, FORCE_Y, FORCE_Z,
%    MOMENT_X, MOMENT_Y, MOMENT_Z,
%    THRUST, TORQUE, FIGURE_OF_MERIT,
%    EQUIVALENT_AREA, NEARFIELD_PRESSURE,
%    TOTAL_HEATFLUX, MAXIMUM_HEATFLUX, 
%    INVERSE_DESIGN_PRESSURE, INVERSE_DESIGN_HEATFLUX,
%    SURFACE_TOTAL_PRESSURE, SURFACE_MASSFLOW
%    SURFACE_STATIC_PRESSURE, SURFACE_MACH
using EFFICIENCY is the same as lift/drag.
best wishes
Tom
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Old   May 15, 2018, 05:04
Question Pitching moment direction
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João Lourenço
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Quote:
Originally Posted by tomp1993 View Post
João,
look at the options at the bottom of the config_template.cfg file.
you can use the option OPT_OBJECTIVE to define the objective for your optimisation.
you can use the same options listed for either objective or constraints, e.g:
Code:
% Available flow based objective functions or constraint functions
%    DRAG, LIFT, SIDEFORCE, EFFICIENCY,
%    FORCE_X, FORCE_Y, FORCE_Z,
%    MOMENT_X, MOMENT_Y, MOMENT_Z,
%    THRUST, TORQUE, FIGURE_OF_MERIT,
%    EQUIVALENT_AREA, NEARFIELD_PRESSURE,
%    TOTAL_HEATFLUX, MAXIMUM_HEATFLUX, 
%    INVERSE_DESIGN_PRESSURE, INVERSE_DESIGN_HEATFLUX,
%    SURFACE_TOTAL_PRESSURE, SURFACE_MASSFLOW
%    SURFACE_STATIC_PRESSURE, SURFACE_MACH
using EFFICIENCY is the same as lift/drag.
best wishes
Tom
Hi Tom,

Thanks for you help. Can you help me in one more thing? If I want to introduce a pitching moment constraint of Mz => -0.087, how I introduce that in SU2? I don't know the axis direction and moments in SU2 and this leave me crazy.

Thanks for you attention,
João Lourenço
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Old   June 2, 2018, 12:44
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João Lourenço
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Quote:
Originally Posted by tomp1993 View Post
João,
look at the options at the bottom of the config_template.cfg file.
you can use the option OPT_OBJECTIVE to define the objective for your optimisation.
you can use the same options listed for either objective or constraints, e.g:
Code:
% Available flow based objective functions or constraint functions
%    DRAG, LIFT, SIDEFORCE, EFFICIENCY,
%    FORCE_X, FORCE_Y, FORCE_Z,
%    MOMENT_X, MOMENT_Y, MOMENT_Z,
%    THRUST, TORQUE, FIGURE_OF_MERIT,
%    EQUIVALENT_AREA, NEARFIELD_PRESSURE,
%    TOTAL_HEATFLUX, MAXIMUM_HEATFLUX, 
%    INVERSE_DESIGN_PRESSURE, INVERSE_DESIGN_HEATFLUX,
%    SURFACE_TOTAL_PRESSURE, SURFACE_MASSFLOW
%    SURFACE_STATIC_PRESSURE, SURFACE_MACH
using EFFICIENCY is the same as lift/drag.
best wishes
Tom

Hi Tom,
Thanks for your help.

Best,
Joao
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