Flow around a porous cylinder

Ema40 · July 30, 2016, 03:43

Dear Members,

I am simulating a 2D problem, with a water flow around a circular cylinder. The cylinder is porous; I set the porosity in "Cell zone conditions" for the cylinder.

1) For porosity higher than 0.5 the solution converges, but for porosity lower than 0.5 it does not converge. I have tried to change the numerical schemes (Quick, second order, etc.), the pressure velocity solving (Piso, Simple, Coupled, etc.), the turbulence model (k-eps, k-eps RNG, k-omega, etc.), the time step (also of more than 10 times lower!). The soultion diverge both in stationary and in transient formulation. The divergence starts from the inside of the cylinder.

2) How can I monitor the Drag at this cylinder? The boundary between the cylinder and the surrounding domain is an interface, not a wall, but Fluent can monitor the drag only at wall surfaces.

Can you help me?

Thank you very much!

Tempest · September 27, 2016, 07:06

Did you get a solution for your problems?

wxn · June 4, 2017, 07:59

Hi Ema40
HiTempest

Did you get a solution for your problems? I also want to know.

July 30, 2016, 03:43	Flow around a porous cylinder	#1
Ema40 Senior Member Join Date: Oct 2014 Posts: 124 Rep Power: 12	Dear Members, I am simulating a 2D problem, with a water flow around a circular cylinder. The cylinder is porous; I set the porosity in "Cell zone conditions" for the cylinder. 1) For porosity higher than 0.5 the solution converges, but for porosity lower than 0.5 it does not converge. I have tried to change the numerical schemes (Quick, second order, etc.), the pressure velocity solving (Piso, Simple, Coupled, etc.), the turbulence model (k-eps, k-eps RNG, k-omega, etc.), the time step (also of more than 10 times lower!). The soultion diverge both in stationary and in transient formulation. The divergence starts from the inside of the cylinder. 2) How can I monitor the Drag at this cylinder? The boundary between the cylinder and the surrounding domain is an interface, not a wall, but Fluent can monitor the drag only at wall surfaces. Can you help me? Thank you very much!

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September 27, 2016, 07:06		#2
Tempest Member Anirudh Kulkarni Join Date: May 2016 Posts: 62 Rep Power: 10	Did you get a solution for your problems?

June 4, 2017, 07:59		#3
wxn New Member sofina Join Date: Jun 2017 Posts: 9 Rep Power: 9	Hi Ema40 HiTempest Did you get a solution for your problems? I also want to know.