Monitor data
Hi, experts.
I have two questions: (1) and (2)
(1)
When I tried to output the Surfaces and Volumes data in Solution > Monitors in HyperWorks CFD using AcuTrans, the following error was displayed. Could you please tell me the cause of this and how to solve it?
acuTrans: *** ERROR: Surface_integral_output_vars <eddy_viscosity> not available
The execution command for outputting "Surfaces" and "Volumes" is as follows.
<Surfaces>：acuTrans -pb Tube -osi -osis "Surface output" -osiv step,time,vel,pres,eddy
<Volumes>：acuTrans -pb Tube -oei -oeis "Volume output" -oeiv step,time,vel,pres,eddy
The error message says "<eddy_viscosity> not available," but the AcuSolve log file shows that eddy viscosity (using RNG k-epsilon) is output, as shown below.
acuRun: -*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
acuTrans: Variable Min Max Ave
acuTrans: x_coordinates -4.000000e-01 4.000000e-01 -6.534649e-04
acuTrans: y_coordinates 2.980232e-09 2.000000e-01 9.799988e-02
acuTrans: z_coordinates -2.725000e-01 2.725000e-01 8.651447e-03
acuTrans: x_velocity -8.650529e-01 1.008648e-01 -1.541183e-02
acuTrans: y_velocity -4.972060e-02 1.293454e-01 6.315525e-05
acuTrans: z_velocity -1.978964e-01 6.973231e-02 3.300391e-04
acuTrans: pressure -6.279264e+01 5.595436e+03 2.830317e+03
acuTrans: eddy_viscosity 0.000000e+00 4.031484e+02 1.081596e-01
acuTrans: kinetic_energy 0.000000e+00 7.187735e-03 4.003934e-04
acuTrans: dissipation_rate 0.000000e+00 3.828002e-02 8.963643e-04
acuTrans: surface_y_plus 0.000000e+00 6.010242e+02 5.014684e+00
acuTrans: surface_film_coefficient 0.000000e+00 3.309524e+03 3.643795e+01
acuTrans: x_wall_shear_stress -1.605429e+00 2.518897e-02 -6.482546e-03
acuTrans: y_wall_shear_stress -1.118103e-01 6.583279e-02 1.102060e-04
acuTrans: z_wall_shear_stress -8.803397e-02 1.272954e-01 3.709562e-05
acuRun: -*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
(2)
When I output the point data set in Solution > Monitors > Probe using AcuTrans, the attached data (original format is .oth file) was output. I don't know what each column of data is because there are no headers. Could you please tell me what these columns mean?
Answers
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Eddy Viscosity is likely not available as integrated surface quantity when using RNG k-epsilon turbulence model. It may be available as nodal output (or extended nodal output) but not as an integrated surface quantity.
The acuTrans command will give some output to the screen - where it also gives the ordering of the variables written to the data file. You'll need to run acuTrans again, and pay attention to the screen/terminal output to get the order of variables.
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Altair Employee