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fix: integrate reviewed LES normalization with explicit dev flow pins

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2026-10-18 07:58:41 -07:00
parent 8403956a9a
commit 95cb6d2b9f
6 changed files with 326 additions and 29 deletions
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src/CelerisLab/lbm/kernels/operators/turbulence_smag.cuh
+6 -4
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@@ -5,7 +5,9 @@
// nu_t = (C_s * Delta)^2 * |S|, Delta = 1 (lattice unit)
// omega_eff = 1 / (3*(nu + nu_t) + 0.5)
//
// |S| is estimated from non-equilibrium second-order moments using tau0.
// |S| = sqrt(2 S_ij S_ij), with Delta = 1 in lattice units.
// The stress estimate uses self-consistent tau_eff; tau0 is molecular.
// Closed form uses full stress. Iteration uses deviatoric stress and a cap.
// ============================================================================
#ifndef CELERIS_OPERATORS_TURBULENCE_SMAG_CUH
@@ -65,12 +67,12 @@ __device__ __forceinline__ float compute_omega_smag(const float* __restrict__ f,
#if LES_CLOSED_FORM
// Closed-form Smagorinsky (no iteration):
// ω = 2 / (τ₀ + √(τ₀² + 18·Cs²·√Q / ρ))
// ω = 2 / (τ₀ + √(τ₀² + 18·√2·Cs²·√Q / ρ))
// where Q = Πneq_ij · Πneq_ij (Frobenius norm squared)
const float Q = pixx*pixx + piyy*piyy + 2.0f*pixy*pixy;
const float sqrtQ = sqrtf(fmaxf(Q, 0.0f));
const float smag_const_sq = LES_CS * LES_CS;
const float discriminant = tau0*tau0 + 18.0f * smag_const_sq * sqrtQ / rho_safe;
const float discriminant = tau0*tau0 + 18.0f * sqrtf(2.0f) * smag_const_sq * sqrtQ / rho_safe;
const float tau_eff = 0.5f * (tau0 + sqrtf(fmaxf(discriminant, tau0*tau0)));
return clamp_omega(1.0f / fmaxf(tau_eff, 0.500001f));
#else
@@ -140,7 +142,7 @@ __device__ __forceinline__ float compute_omega_smag(const float* __restrict__ f,
+ 2.0f*(pixy*pixy + pixz*pixz + piyz*piyz);
const float sqrtQ = sqrtf(fmaxf(Q, 0.0f));
const float smag_const_sq = LES_CS * LES_CS;
const float discriminant = tau0*tau0 + 18.0f * smag_const_sq * sqrtQ / rho_safe;
const float discriminant = tau0*tau0 + 18.0f * sqrtf(2.0f) * smag_const_sq * sqrtQ / rho_safe;
const float tau_eff = 0.5f * (tau0 + sqrtf(fmaxf(discriminant, tau0*tau0)));
return clamp_omega(1.0f / fmaxf(tau_eff, 0.500001f));
#else