vinihcrosaandClaude Sonnet 4.6
dd4e79cbd6
NavalForceModel bridge pattern keeps core::ForceModel interface intact while providing NavalContext (environment, speedToWater, speedToWind, EMA q_avg) to all naval models via bindContext. Force models: Inertial (Coriolis), Restoring (hydrostatic spring), Damping (potential + linear/quadratic), Squat (ICORELS shallow-water), Wind (REGULAR/ACSINKAGE), Current (OBOKATA section-integration and REGULAR with Van der Pol VIM RK4), Thrust (open-water Kt), Rudder (Prandtl lift), Tug (PUSH/PULL/ESCORTING with bilinear table). Wave engine: JONSWAP/PIERSON/REGULAR spectrum, Mitsuyasu cos-2S directional spreading, WAMIT RAO interpolation in WaveForces. NavalSimulation wraps core::Simulation, rebuilds NavalContext each step, maintains EMA (tau=16.5s). 63/63 tests pass. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
55 lines
1.4 KiB
C++
55 lines
1.4 KiB
C++
#include <catch2/catch_test_macros.hpp>
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#include <catch2/catch_approx.hpp>
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#include <ymir/naval/forces/DampingForces.h>
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#include <ymir/naval/NavalContext.h>
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#include <ymir/core/BodyState.h>
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#include <ymir/core/Types.h>
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using Catch::Approx;
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using namespace ymir::naval;
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static NavalContext makeCtx(double u = 0.0, double v = 0.0)
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{
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ymir::Vector6 q{};
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ymir::Vector6 qdot{};
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qdot[0] = u;
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qdot[1] = v;
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ymir::BodyState bs(q, qdot, 0.0, 0.1);
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NavalContext ctx{};
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ctx.state = bs;
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ctx.speedToWater[0] = u;
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ctx.speedToWater[1] = v;
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return ctx;
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}
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TEST_CASE("DampingForces zero velocity produces zero force")
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{
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DampingForces::Config cfg{};
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cfg.linear[0][0] = 100.0;
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cfg.quadratic[0][0] = 50.0;
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DampingForces model(cfg);
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NavalContext ctx = makeCtx(0.0, 0.0);
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model.bindContext(&ctx);
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auto forces = model.compute(ctx.state);
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for (int i = 0; i < 6; ++i)
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REQUIRE(forces.f[i] == Approx(0.0).margin(1e-12));
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}
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TEST_CASE("DampingForces linear surge damps surge velocity")
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{
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DampingForces::Config cfg{};
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cfg.linear[0][0] = 1000.0; // 1 kN·s/m
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cfg.linearDampingCoeff = 0.0; // disable exponential decay for clean check
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DampingForces model(cfg);
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NavalContext ctx = makeCtx(2.0, 0.0); // u = 2 m/s
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model.bindContext(&ctx);
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auto forces = model.compute(ctx.state);
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// F = -B * u = -1000 * 2 = -2000 N
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REQUIRE(forces.f[0] == Approx(-2000.0).margin(1.0));
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}
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