[Krzychu (Chris)]

Hi!

I have created transient simulations with large deformations, and I want to plot some variables from points near the walls. The position of the wall changes and so does the position of the points of interest. I can make charts for points generated by the node number option and that works great. But I want around 25 points form 20 different meshes, and that is too much to input by hand.

Here is my vision on how to do it:
I have a ccl script to put the point in the right position with no deformation
use a function or expression or sth to get the value showed in the GUI point creator "nearest node".
change the definition of point to node number
create charts
export to file

The problem is in point 2. Is it possible to somehow retrieve the number of the node, nearest to a point?

Thank you
Krzychu

[ghorrocks]

monitor points can be set to either interpolate or use the nearest nodal value. They can also be set to move with moving mesh or stay stationary. And you can access monitor points in CEL with the probe() function.

[Krzychu (Chris)]

Thank you Glen.

How about doing this in cfx post? I don't won't to run the calculations again. I don't think I have the patients to wait for the results.

Cheers
Krzychu

[ghorrocks]

I think equivalent functionality is available in CFD-Post with a point object.

[Krzychu (Chris)]

Thanks again,

I will keep looking and restart the simulations.

Cheers
Have a nice day
Krzychu

[Krzychu (Chris)]

Hi again,

I found the option to track the node in the CFX-pre. I couldn't see it because I was still using cfx 14.0.

I noticed I have a different problem. The wall shear monitor is excluded from the output variable list and I do not know why, and how to fix it.

I made a rigid test case, a tube with a rectangular cross-section, to know for sure where the boundaries are. I put a monitor point on the bottom wall and run the simulation. I changed meshes, viscosity, output variables, but it did not help. Any ideas how to fix this?

Monitor Point: Monitor Point 1

Domain: Default Domain
User specified location (x,y,z) : 5.000E-02, 0.000E+00, 5.000E-01

Excluded variables from output variable list:
Wall Shear X
Wall Shear Y
Wall Shear Z

I even checked and these are the only variables excluded from all available.

Thanks

[ghorrocks]

That is because points can be anywhere in space but wall shear only exists at walls. So in general wall shear is not available to points.

Hopefully a simple work-around could be to define a short line segment or small area on your wall and use the lineAve() or areaAve() functions to return a wall shear. As long as the line or area is small then it is effectively a point monitor.

[Krzychu (Chris)]

Thanks again Glenn.

It makes sense that you cannot get WSS at a point, but then why is the option available in the monitor settings in pre. That does not make sense as its not consistent.

Is there a way in introduce a line or an area without editing the geometry?

Cheers
Krzychu