How can I define surface roughness of packed sediment?

lmsun · January 29, 2023, 11:57

Is there any way to define surface roughness or drag coefficient?

I am building a model to simulate sediment transportation on the marsh platform. So the surface roughness derived from the D50 is too small for the marsh platform. I have noticed that the "surface roughness" for the packed sediment component is inactivated. How can I activate the "surface roughness"?

Any comments or suggestions will be highly appreciated!

MSM1985 · January 30, 2023, 02:42

Surface roughness is used to describe the surface undulations of a structure. Sediment itself is a wrinkle/ripple with so called D50. You already defined it in physics > sediment properties. That's why surface roughness will be replaced by packed sediment fraction option for components defined as 'Packed Sediment'.

lmsun · January 30, 2023, 09:46

That makes sense! I really appreciate your explanation. In that case, I will change the surface properties for all the packed sediment components. The aim is to model sediment dynamics on the marsh platform. I could not find a way to incorporate unsubmerged vegetation in my model. Do you have any suggestions to change the surface properties of the marsh only?

MSM1985 · February 1, 2023, 03:11

Surface properties of any object can be changed if you define it as 'solid' rather than 'packed sediment'.

January 29, 2023, 11:57	How can I define surface roughness of packed sediment?	#1
lmsun New Member Limin Sun Join Date: Jan 2023 Posts: 2 Rep Power: 0	Is there any way to define surface roughness or drag coefficient? I am building a model to simulate sediment transportation on the marsh platform. So the surface roughness derived from the D50 is too small for the marsh platform. I have noticed that the "surface roughness" for the packed sediment component is inactivated. How can I activate the "surface roughness"? Any comments or suggestions will be highly appreciated!

January 30, 2023, 02:42		#2
MSM1985 Member Sehroosh Join Date: Apr 2019 Location: Pakistan Posts: 60 Rep Power: 7	Surface roughness is used to describe the surface undulations of a structure. Sediment itself is a wrinkle/ripple with so called D50. You already defined it in physics > sediment properties. That's why surface roughness will be replaced by packed sediment fraction option for components defined as 'Packed Sediment'. lmsun likes this.

February 1, 2023, 03:11		#4
MSM1985 Member Sehroosh Join Date: Apr 2019 Location: Pakistan Posts: 60 Rep Power: 7	Surface properties of any object can be changed if you define it as 'solid' rather than 'packed sediment'. lmsun likes this.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Surface Roughness Drag Analysis	shindiregita	FLUENT	0	May 30, 2020 03:32
In flow3d, How is sediment species flow rate through flux surface and mass of suspend	Sav	FLOW-3D	0	March 13, 2020 04:28
Surface Roughness Problem	hydr_eng1805	FLOW-3D	2	December 15, 2014 09:29
[snappyHexMesh] Layers don't fully surround surface	EVBUCF	OpenFOAM Meshing & Mesh Conversion	14	August 20, 2012 05:31
Free surface boudary conditions with SOLA-VOF	Fan	Main CFD Forum	10	September 9, 2006 13:24

January 30, 2023, 09:46		#3
lmsun New Member Limin Sun Join Date: Jan 2023 Posts: 2 Rep Power: 0	That makes sense! I really appreciate your explanation. In that case, I will change the surface properties for all the packed sediment components. The aim is to model sediment dynamics on the marsh platform. I could not find a way to incorporate unsubmerged vegetation in my model. Do you have any suggestions to change the surface properties of the marsh only?