How can I define surface roughness of packed sediment?

lmsun · January 29, 2023, 10:57

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, 01:42

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, 08:46

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, 02:11

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

January 29, 2023, 10:57	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, 01:42		#2
MSM1985 Member Sehroosh Join Date: Apr 2019 Location: Pakistan Posts: 59 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, 02:11		#4
MSM1985 Member Sehroosh Join Date: Apr 2019 Location: Pakistan Posts: 59 Rep Power: 7	Surface properties of any object can be changed if you define it as 'solid' rather than 'packed sediment'. lmsun likes this.

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January 30, 2023, 08:46		#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?