[quarkz]

Hi,

I have a pitching airfoil case. After reading tutorials, I tried to run my case and it worked and the whole domain rotates together with the airfoil. But I prefer my domain to stay fixed and only the mesh region near the airfoil moves and morphs. How can I do that?

I have also tried to use topoSet to select a region around the airfoil (airfoil) which is supposed to rotate together with the airfoil. It works but then the domain outside the region is entirely fixed with the mesh becomes distorted. So how should I handle it? I have attached the relevant files and pictures. Thanks

dynamicMeshDict

dynamicFvMesh      dynamicMotionSolverFvMesh;

motionSolverLibs ("libfvMotionSolvers.so");

motionSolver solidBody;

cellZone        airfoil;//none;

solidBodyMotionFunction  oscillatingRotatingMotion;
  
oscillatingRotatingMotionCoeffs
	{
	origin (0.25 0.007 0.125);
	amplitude       (0.0 0.0 10.);  //units of deg
    omega           0.698;       //units of rad/s
	//axis (0 0 0);
	}

topoSetDict

actions
(
  {
    name    airfoil;
    type    cellSet;
    action  new;
    source  boxToCell;
    sourceInfo
    {
      box (-1 -1 -1) (3 1 1);
    }
  }
  {
         name    airfoil;
         type    cellZoneSet;
         action  new;
         source  setToCellZone;
         sourceInfo
         {
                 set airfoil;
        }
     }
);

pointDisplacement

dimensions      [0 1 0 0 0 0 0];

internalField   uniform (0 0 0);

boundaryField
{
    wing
    {
        type            calculated;
        value           uniform (0 0 0);
    }

    front
    {
        type            empty;
    }

    back
    {
        type            empty;
    }

    ".*"
    {
        type            fixedValue;
        value           uniform (0 0 0);
    }
	
	airfoil
    {
        
        type        solidBodyMotionDisplacement;
        solidBodyMotionFunction  oscillatingRotatingMotion;
        oscillatingRotatingMotionCoeffs
        {
           origin (0.25 0.007 0.125);
           //axis        (0 0 1);
           amplitude       (0.0 0.0 10);  //units of deg
		   omega           0.698;       //units of rad/s
        }
    }
}

[quarkz]

Hi all,

I finally managed to resolve the problem. I have posted an example here for the benefit of everyone.

It is a naca0012 airfoil with a naca008 flap behind. The flap is supposed to rotate.

https://app.box.com/s/s968xxa6pyfum8esjjs50ttfpr3h7a7o

Hope it helps!

[jrwrodgers]

Could you re-post your solution to this please?! I'm struggling with a similar problem. Thank you

[quarkz]

Hi jrwrodgers, I have posted the solution with the case file. Did you try it?