[bcowling]

Hi,

I am currently creating an OWC WEC with a Wells turbine in Star-CCM+ - simulating the Wells turbine linear pressure drop with a porous region and just had a couple questions. To create the porous region should I be creating a separate 3D part object and assigning it as a porous region or including it as part of the OWC model?
In the CD-Adapco user manual there is both porous region and porous baffle interface options and I am unsure how to implement them correctly, if I need to implement both and the physics values required.

My project is replicating experimental data where the Wells turbine was simulated using a cloth mesh and having a linear pneumatic damping coefficient of 1145 kg/m^4s. From my research I have gathered I can leave Porosity and Porous Inertial Resistance as 0 and input the Porous Viscous Resistance? The units required for Vr are either kg/m^3-s for porous region or m/s for porous baffle interface. I have pressure drop and velocity data from the experiment and have calculated a value of ~48 m/s for Porous Viscous Resistance using Δp= - ρ( α vn + β) vn. Does this sound correct - I am not seeing the pressure drop across the porous region that I should be? Another method I have found uses q = -(Kp*Acs/mu)*deltap/L and solve for 1/Kp to give viscous resistance of ~5*10^8 however I am unsure of the units for this and where to input.

The attached image shows my OWC with the orange plate at the OWC vent being a fluid region with a porous baffle interface between the upper and lower faces of the plate for context. Any help would be greatly appreciated.

Cheers,
Ben