From a1322677247d154171777e4d6888dd8370da5a03 Mon Sep 17 00:00:00 2001 From: ocayon Date: Wed, 4 Nov 2026 12:56:25 +0100 Subject: [PATCH] docs(changelog): describe the circulation velocity as the effective velocity Say that the circulation uses the span-perpendicular effective velocity, including induction, and state the old formula in the same terms. Documentation only, no effect on results. Generated with Claude Code --- changelog.md | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/changelog.md b/changelog.md index 18ccb51..cd1244e 100644 --- a/changelog.md +++ b/changelog.md @@ -7,8 +7,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/). ## [2.3.0] - 04/11/2026 **Default results change.** The lifting-line coupling now follows the consistent -formulation of Gaunaa, Li & Pirrung (TORQUE 2026): circulation from the inner -velocity, span-perpendicular sections, quarter-chord force directions, +formulation of Gaunaa, Li & Pirrung (TORQUE 2026): circulation from the +effective velocity including induction, span-perpendicular sections, +quarter-chord force directions, attached-trailed-vortex forces and a chord-regularised curved bound vortex. Forces, moments and coefficients computed with the defaults differ from 2.2.0, most on swept and curved wings (kites). Each new default can be switched back @@ -19,10 +20,11 @@ This release also contains everything shipped in 2.2.0. `v2.2.0` was tagged on the `improve_plotting` branch, which had not been merged into `develop`/`main`. ### Changed (results) -- Circulation target is `Gamma = 0.5 |V_inner| c Cl` with the inner - (span-perpendicular, own-2D-induction-removed) velocity, instead of - `0.5 Umag^2 / Umagw c Cl`. On the V3 kite the old map put the circulation - 2-6 % low. +- Circulation target is `Gamma = 0.5 |V_eff| c Cl`, instead of + `0.5 |V_eff|^2 / |V_a| c Cl`. `V_eff` is the span-perpendicular effective + velocity: inflow plus induction, without the section's own 2D induction (the + inner velocity of Gaunaa et al.). `V_a` is the span-perpendicular inflow + without induction. On the V3 kite the old map put the circulation 2-6 % low. - Panel frame and chord follow the Crossflow Principle: the chord direction is perpendicular to the bound vortex, the normal is chord x span, and the panel chord is the perpendicular one. Unswept panels are unchanged; on swept panels