Learning Forum

[kingdsystems]

Hi,

I am working on the simulation of fluid pasted various cylindrical body such as smooth cylinder body, helical straked cylinder body and cactus shaped cylindical body. I am trying to compare their effectiveness in mitigating vortex shedding and drag. The structure all have the sample diameter (0.5m) and domain (5m x 15m).

The smooth cylindrical body gave an expected plot showing the lift and drag curve but the other structures didn't. I don't know if i am correct or not as i am relative new in fluent with respect to this.

For the smooth structure, i used the edge sizing and inflation mesh (inflation option: First inflation layer thickness, first layer height: 0.03m, Maximum layer: 40 and growth rate: 2.5). I applied the same mesh to the other structures but i don't know if the result i am having are good.

Please i need advise on the best mesh methods and other settings to achieve a good result on the other structures.

Below are my contour plots for the structure.

SMOOTH STRUCTURE

CACTUS SHAPED

HORN-STRAKED

HELICAL-STRAKED

[Rob]

Those contours look a little odd. How good is the mesh quality? What is the domain inlet velocity?

[kingdsystems]

Thanks Rob for your prompt response. 

The inlet velocity for each of the structure was taken to be 0.021m/s.

Below are the mesh for each of the structures.

SMOOTH STRUCTURE

CACTUS SHAPED STRUCTURE

HORN-STRAKED STRUCTURE

HELICAL-STRAKE

Please, if my meshes are wrong, can you help with best way to go about doing a good mesh.

 

Thanks

[Rob]

I'm not even sure how you've managed to create a mesh like that. Have a look in the Mesher Help and do the tutorials.