Sand slide algorithm

ajayjatoliya · February 8, 2023, 01:24

Hello REEF 3D Team,

In S 93, what should be Delta angle for landslide correction, default value is 0.0. as many of papers mention correction = -2.0

So which one is correct, S 93 2.0 or S 93 -2.0 ?

And what is S 81 and S 82 parameters.

valgrinda · February 9, 2023, 16:37

Use the positive number for S 92, that will work.

S 81: angle of repose phi
S 82: delta phi, will reduce phi for uphill flow and increase it for downhill flow

ajayjatoliya · February 10, 2023, 07:52

Thank you, sir, for your reply

Now I am confused between parameters S 25 and S 81. if both are the same parameters which are the angle of repose, then in the reef 3d manual, it has different default values
S 25 30
S 81 35

the angle of repose in my condition is 30 degrees, so do I need to put S 25 30?
and if I am choosing correction = 2 degree
Then do I need to put S 93 2, S 81 32(30+2) and S 82 2?

valgrinda · February 10, 2023, 11:19

Hi Ajay,

not sure you mean S 25, as it does not exist.

ajayjatoliya · February 10, 2023, 12:27

Ok, thank you, sir, for clearing my doubt. as I am using REEF 3D version 22.04. In the REEF 3D manual, there is an S 25 parameter which is for the angle of repose.

valgrinda · February 10, 2023, 12:31

Please use 23.01. In general: always go with the newest version.

In 23.01, S 25 is removed and sediment transport modeling is improved. For bed shear stress have a look at S 16 4.

ajayjatoliya · February 10, 2023, 13:03

Yes, sir, I got it

Thanks for your valuable suggestion

February 8, 2023, 01:24	Sand slide algorithm	#1
ajayjatoliya Member Ajay Jatoliya Join Date: Nov 2022 Posts: 65 Rep Power: 3	Hello REEF 3D Team, In S 93, what should be Delta angle for landslide correction, default value is 0.0. as many of papers mention correction = -2.0 So which one is correct, S 93 2.0 or S 93 -2.0 ? And what is S 81 and S 82 parameters.

February 9, 2023, 16:37		#2
valgrinda Super Moderator Hans Bihs Join Date: Jun 2009 Location: Trondheim, Norway Posts: 396 Rep Power: 18	Use the positive number for S 92, that will work. S 81: angle of repose phi S 82: delta phi, will reduce phi for uphill flow and increase it for downhill flow __________________ Hans Bihs Team REEF3D www.reef3d.com

February 10, 2023, 11:19		#4
valgrinda Super Moderator Hans Bihs Join Date: Jun 2009 Location: Trondheim, Norway Posts: 396 Rep Power: 18	Hi Ajay, not sure you mean S 25, as it does not exist. __________________ Hans Bihs Team REEF3D www.reef3d.com

February 10, 2023, 12:31		#6
valgrinda Super Moderator Hans Bihs Join Date: Jun 2009 Location: Trondheim, Norway Posts: 396 Rep Power: 18	Please use 23.01. In general: always go with the newest version. In 23.01, S 25 is removed and sediment transport modeling is improved. For bed shear stress have a look at S 16 4. __________________ Hans Bihs Team REEF3D www.reef3d.com

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February 10, 2023, 07:52		#3
ajayjatoliya Member Ajay Jatoliya Join Date: Nov 2022 Posts: 65 Rep Power: 3	Thank you, sir, for your reply Now I am confused between parameters S 25 and S 81. if both are the same parameters which are the angle of repose, then in the reef 3d manual, it has different default values S 25 30 S 81 35 the angle of repose in my condition is 30 degrees, so do I need to put S 25 30? and if I am choosing correction = 2 degree Then do I need to put S 93 2, S 81 32(30+2) and S 82 2?

February 10, 2023, 12:27		#5
ajayjatoliya Member Ajay Jatoliya Join Date: Nov 2022 Posts: 65 Rep Power: 3	Ok, thank you, sir, for clearing my doubt. as I am using REEF 3D version 22.04. In the REEF 3D manual, there is an S 25 parameter which is for the angle of repose.

February 10, 2023, 13:03		#7
ajayjatoliya Member Ajay Jatoliya Join Date: Nov 2022 Posts: 65 Rep Power: 3	Yes, sir, I got it Thanks for your valuable suggestion