Porous Media model and mesh size

Sdvk · September 17, 2015, 11:13

Porous media model can be used in order to avoid to describe explicitly complex geometries (packing,..) which would require really cell consuming mesh discretization.

I get that pressure drop will be calculated from empirically formulation (Ergun) allowing to reproduce the flow resistance that the explicit geometry would provide.

But I can't find any recommendation regarding the size of the mesh inside the porous zone. How coarser can it be ? Is it an important matter as blockage is not physically represented inside the porous zone and a superficial velocity is by default introduced.. What about turbulence phenomena ?

Thanks to enlighten me on this topic

devesh.baghel · September 18, 2015, 02:52

Hi,

Is there any heat transfer/reaction modelling involve in porous zone while calculation ?
If it is a simple case of flow problem with porous media, keep the uniform cell size as entrance/exit of porous zone. It will control the jump in momentm calculation and will be ease as we provide higher resistance to rest of the direction of flow.

Regards

September 17, 2015, 11:13	Porous Media model and mesh size	#1
Sdvk New Member Francisco Bailly Join Date: Feb 2014 Posts: 3 Rep Power: 12	Porous media model can be used in order to avoid to describe explicitly complex geometries (packing,..) which would require really cell consuming mesh discretization. I get that pressure drop will be calculated from empirically formulation (Ergun) allowing to reproduce the flow resistance that the explicit geometry would provide. But I can't find any recommendation regarding the size of the mesh inside the porous zone. How coarser can it be ? Is it an important matter as blockage is not physically represented inside the porous zone and a superficial velocity is by default introduced.. What about turbulence phenomena ? Thanks to enlighten me on this topic

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September 18, 2015, 02:52		#2
devesh.baghel Member Devesh Baghel Join Date: Mar 2009 Posts: 84 Rep Power: 17	Hi, Is there any heat transfer/reaction modelling involve in porous zone while calculation ? If it is a simple case of flow problem with porous media, keep the uniform cell size as entrance/exit of porous zone. It will control the jump in momentm calculation and will be ease as we provide higher resistance to rest of the direction of flow. Regards