FhSim
3.1.0
Marine systems simulation
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Documentation pages not part of the main user documentation
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Base Overview
Review issues — fhsim_base
Testing report
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Coribo Overview
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Review issues — fhsim_coribo
0012 — ConstraintSolver warm-starts a 5-iteration CG from the previous call, so OdeFcn is not idempotent
Testing report
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Usage
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Review issues — fhsim_environment
0139 — The environment library links the static FhSim::fhsim_vis, so it carries its own copy of the engine
0130 — NetCDF variables are read in the order (time, zc, yc, xc) without checking it
0140 — A converter from a Gaussian aggregation to the compact polynomial bump
0141 — PorousDiscWakeSource stores the ISimObjectCreator pointer past FinalSetup
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Testing report
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Review issues — fhsim_environment
0139 — The environment library links the static FhSim::fhsim_vis, so it carries its own copy of the engine
0130 — NetCDF variables are read in the order (time, zc, yc, xc) without checking it
0140 — A converter from a Gaussian aggregation to the compact polynomial bump
0141 — PorousDiscWakeSource stores the ISimObjectCreator pointer past FinalSetup
Wakes
Wake parameters
Hydrodynamics: shape and panel load laws
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Panel load laws: validation report
Validation: MF2022 towed panels (L1-L4)
Validation: Zhan 2006 planar nets (L8)
Validation: Rudi 1988 and Løland 1991 (L5, L6)
Validation: a3/b4 consistency and refit (L9)
Migrating a downstream project to fhsim 3.1.0
Regression baselines
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Marine_elements Overview
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Review issues — fhsim_marine_elements
0435 — RigidBarCable engine carries end control and error sum between OdeFcn calls
0436 — Cable numerical damping acts on the velocity relative to the earth, not the water
0428 — The library builds with 211 warnings under -Wall -Wextra
Testing report
Net hydrodynamics: methods manual
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Net hydrodynamics: SimObject-level validation report
Validation: Zhan 2006 cylinder (S2, W9, S6)
Validation: Lader 2009 cages (S3, S4)
Validation: towed panel through the SimObject (S1)
Validation: trawl (S7)
Net hydrodynamics: benchmark of load laws and wake evaluation
Net hydrodynamics: downstream check in fhsim_fishery
Old against new: what changed in the results since October 2025
Migrating to 3.0.0
Net core: shared parameters and net file format
Trawl net specification (XML)
Regression baselines: review of the 2026-09-27 regeneration (MARE-0099, WP-A12)
Recipe: Analytical Jacobian for NetStructure
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Fishery Overview
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Review issues — fhsim_fishery
0120 — Sample clocks and controllers start at 0 whatever TStart is
0132 — Trawl/Vessel WarpVel leaves out the yaw rate
Testing report
Steady tow of the morenot520 trawl
Attic
Maritime Overview
Bio Overview
Aquaculture Overview
MarEnv
Review issues
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1.9.8