This guide is designed for CFD students, researchers and authors preparing defensible technical work for a thesis or journal paper. Apply the recommendations to the actual physics, solver, evidence and publication requirements of your project.
Start from the flow physics
Model selection should reflect separation, streamline curvature, rotation, buoyancy, transition, anisotropy, unsteadiness and the quantities of interest—not software default settings.
- Estimate Reynolds number and expected regime
- Identify adverse pressure gradients and separation
- Assess rotation, swirl and anisotropy
- Decide whether time-resolved structures matter
Understand the model families
Two-equation RANS models offer practical cost for many engineering studies; Reynolds-stress models add anisotropy representation; LES and hybrid approaches resolve more turbulence but require suitable mesh, timestep and sampling.
- k-epsilon family for many free-shear/internal flows
- k-omega SST for near-wall and separated-flow robustness
- RSM for strongly anisotropic or swirling flows
- LES/hybrid only with resolution and statistical evidence
Align wall treatment and y+
A turbulence model cannot be justified independently of near-wall resolution. State wall treatment, first-cell strategy, prism layers and solved y+ distribution on critical surfaces.
- Choose low-y+ or wall-function intent deliberately
- Report distributions rather than only average y+
- Check prism coverage and total thickness
- Keep wall treatment consistent through mesh studies
Perform sensitivity and validation
Compare models using outputs that support the paper's conclusions. Do not select the model that happens to match one scalar while failing profiles or physics elsewhere.
- Use identical geometry, mesh intent and boundaries
- Compare pressure, velocity, heat transfer and separation
- Consider experimental uncertainty
- Explain accuracy-versus-cost tradeoffs
Write the journal justification
Describe the physical reasons, wall strategy, prior evidence and project-specific sensitivity results. Avoid generic statements that a model is 'widely used' or 'more accurate.'
- State expected strengths and limitations
- Cite relevant validation rather than popularity
- Report sensitivity where model form matters
- Limit conclusions to the supported regime
Continue the complete publication workflow
Connect this topic to research design, CFD execution, verification, validation, manuscript development and peer review.
Related Abecator resources
Questions about applying this guide
How should How to Select and Justify a Turbulence Model for a CFD Paper be used in a CFD research project?
Use this guide as a documented decision step within the wider research workflow. Record the assumptions, evidence, outputs and limitations so the work can be understood, reproduced and defended during journal review.
Can Abecator support only this stage or the complete publication workflow?
Yes. Students and researchers can request focused support for this stage, collaborate with Abecator on selected tasks, or choose complete support from research idea and CFD execution through manuscript preparation, submission and reviewer revisions.
Move your CFD research from idea to publication
Abecator can shape the research question, build and run the CFD cases, analyse the data, develop the manuscript, support submission and respond to reviewers. Choose complete execution, close collaboration or focused help—and decide how involved you want to be.