[tareqkh]

Hi All,

I have been working on the ActuatorDisk model "code" provided in the following link http://www.tfd.chalmers.se/~hani/kurser/OS_CFD_2010/erikSvenning/erikSvenningReport.pdf. "In the implementation, the momentum transferred to the fluid is added as a volume force. The volume force varies in the radial direction and it is calculated such that a prescribed total thrust and torque is imposed on the fluid. For the volume force in the axial and tangential direction, expressions similar to those given in are adopted. The volume forces are computed in such a way that the force distribution approximately follows the Goldstein optimum" In summary, the model requires thrust and torque forces for a given rotor e.g. rotor hub and tip diameters in order to be able to analyze the wake of the turbine. I am trying to verify the 3D vs axisymmetric results. For the axisymmetric simulations, wedge boundary condition was used. The reason for the comparison is to understand how wedge BC works according to the implementation. The results as below;

u velocity component;
1.jpg

v velocity component;
2.jpg

Normal force component;
3.jpg

As can be noticed, the normal force shows a very considerable deviation compared to the 3D simulations. I am trying to learn the reason of this discrepancy so that I can improve the model. I can post more details if needed. Also, you would appreciate any insight on the topic.

Thanks in advance,

[tareqkh]

Anyone interested in the topic could provide me some hints?