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DSD-NL 2014 - NGHS Flexible Mesh - CB&I pilot 3D lagune modeling using ADCP measurements, Arnold van Rooijen, Deltares
1. 20 juni 2014
3D lagoon modeling using D-Flow FM:
BaΓa de SΓ£o Marcos
Lucas Silveira, Jonas Oliveira, Alex Falkenberg, Luana
Taiani, Leticia Nascimento, Joao Dobrochinski
(Arnold van Rooijen)
2. 20 juni 2014
Rio de Janeiro
FlorianΓ³polis
Study location:
BaΓa de SΓ£o Marcos
Porto Alegre (NL-AUS)
Salvador (NL-SP)
BaΓa de SΓ£o Marcos
3. 20 juni 2014
Content
β’ Introduction
β’ Delft3D modeling
β’ D-Flow FM curvilinear
β’ D-Flow FM unstructured
4. Introduction
β’ BaΓa de SΓ£o Marcos
(MaranhΓ£o, NE Brazil)
β’ Mearim River discharge up
to 2000 m3/s
β’ Tidal range
β’ 4-5 m (ocean)
β’ Up to 7m within bay
β’ Tidal bore phenomenon
(Pororoca)
β’ Navigation channel all the
way into the river
20 juni 2014
Terminal Portuario do
Mearim
10. D-Flow FM curvilinear
β’ Converted Delft3D model using dflowfmConverter.m (Open Earth
Tools)
β’ Same grid,
β’ Same boundary conditions,
β’ Same model settings,
β’ Fixed computational timestep,
β’ 2DH vs. 3D model
20 juni 2014
14. D-Flow FM curvilinear
20 juni 2014
Delft3D D-Flow FM Delft3D D-Flow FM
water level
Taua2 0.952 0.951 0.402 0.408
Perizes2 0.959 0.956 0.423 0.44
Mean 0.956 0.954 0.413 m 0.424 m
velocity
Canal2A 0.921 0.922 0.322 0.345
P1A 0.966 0.967 0.345 0.322
P1B 0.914 0.95 0.304 0.242
P1C 0.967 0.979 0.25 0.221
P2A 0.921 0.913 0.294 0.306
P2B 0.966 0.955 0.331 0.35
P2C 0.977 0.974 0.292 0.318
P3 0.954 0.964 0.238 0.227
Mean 0.948 0.952 0.306 m/s 0.3 m/s
RMSER2
2DH model
15. D-Flow FM curvilinear
20 juni 2014
Delft3D D-Flow FM Delft3D D-Flow FM
water level
Taua2 0.953 0.938 0.395 0.46
Perizes2 0.96 0.947 0.423 0.466
Mean 0.956 0.943 0.409 m 0.463 m
velocity
Canal2A 0.876 0.922 0.538 0.328
P1A 0.91 0.965 0.32 0.284
P1B 0.697 0.923 0.607 0.293
P1C 0.809 0.967 0.634 0.249
P2A 0.85 0.919 0.369 0.283
P2B 0.865 0.953 0.531 0.335
P2C 0.845 0.961 0.662 0.324
P3 0.89 0.956 0.411 0.221
Mean 0.843 0.946 0.509 m/s 0.29 m/s
R2 RMSE
3D model
16. D-Flow FM unstructured
20 juni 2014
β’ Setting up a new grid using the full flexible
mesh functionality:
β’ Using DeltaShell user interface
β’ βCurvilinear grids where possible, triangles
etc. where neededβ
β’ Same forcing, settings etc.
21. D-Flow FM unstructured
20 juni 2014
Delft3D D-Flow FM Delft3D D-Flow FM
water level
Taua2 0.952 0.963 0.402 0.44
Perizes2 0.959 0.942 0.423 0.542
Mean 0.956 0.952 0.413 m 0.491 m
velocity
Canal2A 0.921 0.92 0.322 0.399
P1A 0.966 0.913 0.345 0.566
P1B 0.914 0.971 0.304 0.215
P1C 0.967 0.979 0.25 0.201
P2A 0.921 0.796 0.294 0.553
P2B 0.966 x 0.331 x
P2C 0.977 x 0.292 x
P3 0.954 0.955 0.238 0.553
Mean 0.948 0.922 0.306 m/s 0.376 m/s
R2 RMSE
22. Model efficiency
Processor: Intel(R) Coreβ’i7-3930K CPE @ 3.20GHz 3.20 GHz
Memory (RAM): 16,0 GB
System Type: 64-bit Operating System
Number of Threads: 12
20 juni 2014
Delft3D D-Flow Curvilinear D-Flow Unstructured
2D 258 240 202
2D (auto ts) x 330 321
3D 2248 903 x
3D (auto ts) x 3308 x
β’ D-Flow FM faster than Delft3D, especially in 3D
β’ Probably (a.o.) due to OpenMP multicore
23. Conclusions
20 juni 2014
β’ Delft3D model of BaΓa de SΓ£o Marcos was converted to a D-Flow
FM model
β’ Curvilinear (Delft3D grid)
β’ Unstructured grid (from scratch)
β’ Results Delft3D vs. D-Flow FM curvilinear very similar
β’ DFM runs a little faster for this setup
β’ D-Flow FM unstructured model seems to perform similar in
accuracy, however there was a numerical issue halfway the
simulation
24. Next steps
β’ Watch the World Cup
β’ Look into numerical instability in unstructured model (adjust grid)
β’ Look into 3D model performance
20 juni 2014