How-to
HENMESH y+ and farfield: sizing for aerospace CFD prep
HENDOI · 2 November 2026
How to set target y+, Mach/α sizing references and farfield chord counts in HENMESH — preprocessor estimates, not guaranteed CFD y+ after export.
HENMESH Setup asks for target y+, reference Mach and α, while Domain asks for farfieldChords. These drive preprocessor spacing estimates for labelled aerospace meshes. They are not a promise that your downstream CFD solver will measure the same y+ on the exported grid.
Target y+
- Use ~1 when you are preparing for viscous-oriented screens.
- Higher targets may suit inviscid-oriented prep — document why.
- Always re-check Quality after Generate; y+ is an input estimate, not a post-solve CFD probe.
Farfield in chords
- Example starting value: 20 chord lengths.
- Too small → outer boundary pollution risk in later CFD.
- Too large with coarse normalPoints → wasted cells far away; raise normalPoints if you push farfield out.
Mach and α as sizing references
Setup Mach/α inform spacing heuristics so the mesh family matches the freestream you intend to run later in HENFLOW or another code. Align them with the freestream you will actually solve (HENFLOW setup guide).
Save → Generate → Quality loop
- Domain: topology, chord, point counts, farfield → Save.
- Setup: method, y+, Mach, α → Save.
- Generate → inspect skew / aspect / element quality.
- Change one driver → Save → Generate again.
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This page sits in How-to. HENFOIL, HENSYNTH, HENFLOW, HENSTRUCT and HENMESH share one account. These articles are screening lessons — not certification reports.
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HENMESH
Structured airfoil C/O grids and section domain packs before HENFLOW or HENSTRUCT — prep with method IDs, not a general mesh tool.
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Turn this lesson into a section you can draw, check, analyse and compare. Run the polar at the Reynolds number of the vehicle. The method name stays on the result.
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After the section is chosen, set geometry and mission requirements, run screening, read compliance, synthesize candidates and download or mail the report.
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Labelled aerospace 2D CFD — panel, viscous, Euler and NS-SA — with method IDs on every Cp plot. Screening only, not certification CFD.
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Plate and panel linear static screens with method IDs for early structural review — not general multiphysics FEA or certification analysis.
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