Relationship between mesh size and sediment size (d50)

debasish91 · August 29, 2023, 12:55

When doing a scour analysis with movable bed usually the mesh size and sediment size cannot be considered independent unless a certain relationship is satisfied. In my case grid size is 0.02 m and d50 is 0.0002 m. Then how scour and boundary layer is calculated?

valgrinda · September 10, 2023, 10:58

The boundary layer is not resolved, instead wall functions for velocities and turbulence parameters are used.

The mesh size and particle diameter are not connected.

August 29, 2023, 12:55	Relationship between mesh size and sediment size (d50)	#1
debasish91 New Member Debasish Dutta Join Date: Apr 2019 Location: India Posts: 5 Rep Power: 7	When doing a scour analysis with movable bed usually the mesh size and sediment size cannot be considered independent unless a certain relationship is satisfied. In my case grid size is 0.02 m and d50 is 0.0002 m. Then how scour and boundary layer is calculated?

September 10, 2023, 10:58		#2
valgrinda Super Moderator Hans Bihs Join Date: Jun 2009 Location: Trondheim, Norway Posts: 377 Rep Power: 17	The boundary layer is not resolved, instead wall functions for velocities and turbulence parameters are used. The mesh size and particle diameter are not connected. __________________ Hans Bihs Team REEF3D www.reef3d.com

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