[aravindh28.4]

I am currently doing a simulation of "Vortex Induced Vibrations" for my bachelor thesis on OpenFOAM(version2.1.0), and want some help in understanding some of the term in the pointDisplacement file in the 0 folder of the case file(../openfoam201/tutorials/incompressible/pimpleDyMFoam/wingMotion/wingMotion2D_pimpleDyMFoam/0).

What exactly is the orientation tensor and the angularMomentum entry in the pointDisplacement file?

Also I am will be changing the dimension of the body(cylinder in my case) and hence have to change the anchor point of the spring. does this have to be done by trial and error or is there some way of finding the point co-ordinates in paraview?

I am new to this software, so please excuse me if these questions were basic.

[MrAnderson]

Dear Aravindh,

I am doing PhD and also started recently with OpenFOAM simulations based on Vortex Induced Vibrations around a circular cylinder. For this, I have tried to modify the pointdisplacement file with respect to the cylinder. However, I also do not know how to implement diferent fields in this file. Like, 'orientation' to be just an example...

Maybe, we can try to help each other out since we want to simulate the same case?? Later on, I also want to extend the number of rigidbodies to consist of 4 cylinders and would like to know how to implement this?


All the best

/MrAnderson

[aravindh28.4]

Dear Mr. Anderson

Sure sir, by helping each other, both of us can progress. How far have you proceeded? My simulation is just a 2D case. So, orientation is not an issue for me. I just removed that matrix part from the file. It works... Now I need to know what exactly the spring attachment parameters mean physically, like the anchor, refAttachmentPt etc.

Kindly help me out in this regard.

[MrAnderson]

Dear Arawindh,

Sorry for my late reply. I am still struggling with the same problem as you are. Parameters such as restLength, anchor, refAttachmentPt is also unknown for me. I'll try to work with this during the coming days. I will let you know if I achieve any progress.


Well, I've found out though that fixedAxis is for rotation and fixedLine is for pure translation. So, if only translation is desired, then it is just to remove fixedAxis and the corresponding angularmomentum.

Let's work on it and hopefully it will be solved!

[niaz]

Dear Mr Anderson
Restlength = x0
refAttachmentPt= place that the force of string should apply
anchor = the distance from the spring hook to the object