DISSIP warning and iteration problem - Coast/Estuary - Delft3D
intro story Coast / Estuary
Coast / EstuaryCoastal systems are among the most dynamic physical systems on earth and are subject to a large variety of forces. The morphodynamic changes occurring to coastlines worldwide are of great interest and importance. These changes occur as a result of the erosion of sediments, its subsequent transport as bed load or suspended load, and eventual deposition. Estuaries are partly enclosed water bodies that have an open connection to the coast. Estuaries generally have one or more branching channels, intertidal mudflats and/or salt marshes. Intertidal areas are of high ecological importance and trap sediments (sands, silts, clays and organic matter). Within the Delft3D modelling package a large variation of coastal and estuarine physical and chemical processes can be simulated. These include waves, tidal propagation, wind- or wave-induced water level setup, flow induced by salinity or temperature gradients, sand and mud transport, water quality and changing bathymetry (morphology). Delft3D can also be used operationally e.g. storm, surge and algal bloom forecasting. On this discussion page you can post questions, research discussions or just share your experience about modelling coastal and/or estuarine systems with Delft3D FM. ** PLEASE TAG YOUR POST! ** | Sub groups
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DISSIP warning and iteration problem
I am having a problem when I run Delft3d-wave. With a grid cell size of larger than 30m x 30m the model s runs normally and I only receive a warning shown below but when I decrease the size to a smaller cell size, 20m x 20m or 15m x 15m, I start having problems. The SWAN model starts the iterations normally but after the firth iteration the accuracy starts to decrease. The run ends at 30-40% accuracy even after 100 iterations.
I only receive a warning for
WARNING: Found negative value(s) for DISSIP in swanout1 file;
value(s) set to zero
Could some please help me with this problem?
Kind regards
George
Monique Villatoro, modified 2 Years ago.
RE: DISSIP warning and iteration problem
Youngling Posts: 5 Join Date: 5/14/12 Recent PostsThanks,
Monique
Philip Jayson-Quashigah, modified 2 Years ago.
RE: DISSIP warning and iteration problem
Youngling Posts: 11 Join Date: 8/13/15 Recent PostsI am doing a nested model and I get similar warning and the model stops. Any help so far?
E:\DECCMA\Delf3D Model_Volta\Nested New\TestWave\Nested>rem exit
>>...End of SWAN run
Allocate output fields
Read SWAN output
WARNING: Found negative value(s) for dissip(2) in swanout file;
value(s) set to zero
Map WAVE parameters to FLOW grid 1
Write WAVE map file, nest 2 time 0.000
Time written 0
forrtl: severe (170): Program Exception - stack overflow
Image PC Routine Line Source
wave.exe 00007FF7889E1F88 Unknown Unknown Unknown
wave.exe 00007FF788971F11 Unknown Unknown Unknown
wave.exe 00007FF7887C8903 Unknown Unknown Unknown
wave.exe 00007FF788761DF8 Unknown Unknown Unknown
wave.exe 00007FF7888FF9AE Unknown Unknown Unknown
wave.exe 00007FF7889E21A9 Unknown Unknown Unknown
KERNEL32.DLL 00007FFC27D01FE4 Unknown Unknown Unknown
ntdll.dll 00007FFC27F9EFB1 Unknown Unknown Unknown
I have a service package and 3.05.04.7545M
Qinghua Ye, modified 2 Years ago.
RE: DISSIP warning and iteration problem
Jedi Council Member Posts: 610 Join Date: 3/2/11 Recent PostsHi Philip,
It seems to me the error message is on the model size. Maybe the number of grid is too big, which your computer/memory cannot handle.
Pls check,
Qinghua
Philip Jayson-Quashigah, modified 2 Years ago.
RE: DISSIP warning and iteration problem
Youngling Posts: 11 Join Date: 8/13/15 Recent PostsThanks Qinghua
That is possible because it runs alright for the course grid alone.
I will check on it.
Regards
Philip Jayson-Quashigah, modified 2 Years ago.
RE: DISSIP warning and iteration problem
Youngling Posts: 11 Join Date: 8/13/15 Recent PostsHi Qinghua
Could I be running into memory issues still? I have reduced the model area and grids and using a time varying space varying boundary condition. The flow stand alone runs fine as with if I include sediments but once I couple with wave it initiates but hangs at the 0% time-step and nothing in the tri-diag file to help. Can you kindly take a look at the model.
I am using and i5 desktop with 16gb Ram and am using version 6.02.13.7545M
Thanks in advance
Attachments:
Otelia Swan, modified 5 Months ago.
RE: DISSIP warning and iteration problem
Youngling Posts: 1 Join Date: 9/30/20 Recent PostsHi Qinghua
Could I be running into memory issues still? I have reduced the model area and grids and using a time varying space varying boundary condition. The flow stand alone runs fine as with steamdb if I include sediments but once I couple with wave it initiates but hangs at the 0% time-step and nothing in the tri-diag file to help. Can you kindly take a look at the model.
I am using and i5 desktop with 16gb Ram and am using version 6.02.13.7545M
Thanks in advance