SU2 version 7.3.0 "Blackbird"

SU2 version 7.3.0 introduces important new features:

• Passive species transport (tutorial).
• A smoothing method for discrete adjoint gradients (example).
• Customizable objective function (example).
• Options to keep intermediate solution files (documentation).
• Robustness improvements of the NEMO solver.
• HDF5 backend for CGNS meshes.

This release includes an important fix to the SA-neg turbulence model which could reduce oscillations in the solution, the option CONV_CRITERIA had been marked for deprecation in v7.2.1 and it is now removed.

🚀 Experimental Features

• Add a Sobolev smoothing method to the discrete adjoint gradient calculation. @thomasdick (#1446)
• Add HDF5 backend support for CGNS in SU2 @MicK7 (#1500)
• Options for appending iteration number to filenames (keep solution snapshots) @bigfooted (#1465)
• Custom objective function (e.g. 'DRAG + LIFT') @pcarruscag (#1478)
• Feature species - more adjoint parts @TobiKattmann (#1461)
• Species transport solver (passive for now) @TobiKattmann (#1388)
• Implementation of Implicit for viscous NEMO problems @WallyMaier (#1422)

💊 Bug Fixes

• NEMO: protection for viscous flow with ionization @CatarinaGarbacz (#1497)
• Fix implicit call for NEMO cases @WallyMaier (#1482)
• Fix "offline" builds with meson @pcarruscag (#1475)
• Explicit Euler in CScalarSolver @maxaehle (#1435)
• Fix compilation with GCC 4.8.5 @pcarruscag (#1445)
• Fix mistake in axisymmetric turbulent source production term @FlorianDm (#1438)
• Fixes to inlet files @TobiKattmann (#1427)
• Fix bug in SA-neg diffusion term (and generalize indices of flow variables for use by scalar solvers and numerics) @pcarruscag (#1392)
• Fix compilation with GCC 4.8.5 @pcarruscag (#1421)
• Set MUSCL Reconstruction for NEMO in Develop to use smallest limiter val for all primitives @jtneedels (#1428)

🔧 Maintenance

• Copyright 2022 @pcarruscag (#1517)
• Upgrade to meson 0.61.1 @pcarruscag (#1509)
• Use pregenerated files for cross-compilation of hdf5 @MicK7 (#1512)
• Small cleanup of NEMO solver @WallyMaier (#1488)
• Changed the registration of AD input variables in CDiscAdjFluidIteration @thomasdick (#1492)
• Updating remain version numbers @WallyMaier (#1485)
• Inform user of possible CGNS memory usage issue @MicK7 (#1479)
• Using the primitive variable index classes in more places (+ minor chores) @pcarruscag (#1476)
• Treat SU2_CFD library similar to Common in meson build process @thomasdick (#1470)
• Change to enum class: SGS_MODEL, SHOCK_CAPTURING, VERIFICATION_SOLUTION @bigfooted (#1457)
• Change transition to enum class @bigfooted (#1453)
• Change kind_solver option to enum class @bigfooted (#1451)
• Collect Turb output from Comp/Inc/Nemo in CFlowOutput @TobiKattmann (#1449)
• Clean LoadRestart for Flow/Turb/Heat @TobiKattmann (#1450)
• Changes for new libROM API @jtlau (#1436)
• Fixed an error for the Coupled RHT-CFD Adjoint test in serial_regression_AD.py @thomasdick (#1437)
• Test cases for turbulence model variants @suargi (#1418)