Divergence issue with S60 (Suspended Sediment Time Scheme)

Tsuyu · November 26, 2025, 10:03

Hi everyone,

I am currently simulating sediment transport around a bridge pier using REEF3D.

I am encountering a divergence issue when changing the time scheme for suspended sediment (parameter S 60). The simulation runs stable with the default setting, but the calculation diverges when I set S 60 to 3 or 11.

Could anyone explain the possible cause of this instability? I would appreciate it if you could share any countermeasures or recommended settings to make it stable.

Thank you.

valgrinda · December 17, 2025, 03:17

Hi Tsuyu,

are you also using S 12 1?

Tsuyu · December 17, 2025, 04:00

Hi valgrinda,

Thanks for the reply. I'm using S12 1.

valgrinda · December 17, 2025, 04:07

Hi Tsuyu,

could you upload your setup? Or send to me directly?

Tsuyu · December 17, 2025, 04:19

Hi valgrinda,

I've uploaded the settings. Please check.

November 26, 2025, 10:03	Divergence issue with S60 (Suspended Sediment Time Scheme)	#1
Tsuyu New Member Tsuyu Join Date: Feb 2025 Posts: 7 Rep Power: 2	Hi everyone, I am currently simulating sediment transport around a bridge pier using REEF3D. I am encountering a divergence issue when changing the time scheme for suspended sediment (parameter S 60). The simulation runs stable with the default setting, but the calculation diverges when I set S 60 to 3 or 11. Could anyone explain the possible cause of this instability? I would appreciate it if you could share any countermeasures or recommended settings to make it stable. Thank you.

December 17, 2025, 03:17		#2
valgrinda Super Moderator Hans Bihs Join Date: Jun 2009 Location: Trondheim, Norway Posts: 448 Rep Power: 20	Hi Tsuyu, are you also using S 12 1? __________________ Hans Bihs Team REEF3D www.reef3d.com

December 17, 2025, 04:07		#4
valgrinda Super Moderator Hans Bihs Join Date: Jun 2009 Location: Trondheim, Norway Posts: 448 Rep Power: 20	Hi Tsuyu, could you upload your setup? Or send to me directly? __________________ Hans Bihs Team REEF3D www.reef3d.com

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December 17, 2025, 04:00		#3
Tsuyu New Member Tsuyu Join Date: Feb 2025 Posts: 7 Rep Power: 2	Hi valgrinda, Thanks for the reply. I'm using S12 1.