[HenningW]

Hi everyone,

I have a case with moving airfoils to influence the flow. Since I am not actually interested in the moving airfoils but in their wake, I simulated the moving airfoils and probed the wake with a surface. My plan is to use the results as an input for future simulations at the inlet so I do not need to simulate the airfoils and to avoid a moving mesh. I was able to move the post processing files (surface via probe in OF-Format) files to constant/boundaryData/inlet for each time step and add the correct header (comparable to the example for timeVaryingMappedFixedValue, just for each time step I resolved).

Two questions arose to me:

1. Will OpenFoam interpolate the timesteps inbetween?

2. How do I handle the fact that the amount of points differ between the time steps? So far I used probed via a cutting plane surface. This results in the aforementioned different amout of points and thus in this error:

Create time

Create mesh for time = 0

Reading field p



--> FOAM FATAL ERROR:
Number of values (38623) differs from the number of points (38748) in file "./test_inlet_from_slice/constant/boundaryData/inlet/4e-05/p"

From function timeVaryingMappedFixedValueFvPatchField<Type>::che ckTable()
in file fields/fvPatchFields/derived/timeVaryingMappedFixedValue/timeVaryingMappedFixedValueFvPatchField.C at line 425.

FOAM exiting

I put a points file into the folder (from a random time step) of the inlet patch below the folders of each time step (caparable to the tutorial case in incompressible/simpleFoam/pitzDailyExptInlet). I could provide the points file for each time step though, I just have no clue how to make use of it).

Any help to solve this is appreciated. Since the flow is complex i cannot discribe it via GroovyBC though.

Sincerely,

Henning

[pivee_]

Hi everyone,
It's been a long time since this thread is opened and still no replies. I just want to know if someone has an idea of how to deal with the number of values that differs from the number of points. I obviously know that I should change the "input geometry" in order to have the same points. But in my case I can't do that so I was asking if there are some way to process the values in order to have the same number of points.
Additionaly, do you have any idea of how is the order of the values saved? Same order as the points in the corrisponding face?
I mean, if my face has points: (213 3893 1 984)
then the values saved iby my sample process would be:
value(1)
value (213)
value (984)
value (3893) ?


Thanks a lot for any help,
Enrico


EDIT: I got the solution. I was running the sampling without the options 'interpolate' and 'triangulate' so the number of point that I had from sampling was different from the number of field values (actually, idk why)
So i tried to add:

triangulate false;
interpolate true;

to my function for sampling and it works. From what I could learn, triangulate false decrease the number of values for fields (in my case from 800 to 400) and then with interpolation it can increase (in my case from 400 to 451)

I'm sorry for my low level question but I'm still a begineer with OF.
Hope it cen helps someone!