CFD TOPIC HUB · TURBOMACHINERY
Turbomachinery CFD: connect rotating frames, interfaces and blade-flow evidence.
Use this hub for gas-turbine, compressor, fan, pump and other rotating-flow CFD where frame definitions, rotor-stator coupling, wall resolution and transient timescales control the result.
Start from the decision the CFD model has to support.
The rotating method should follow the engineering question. A steady MRF approximation and a transient sliding-mesh model answer different questions and require different evidence.
Use these checks before adding model complexity.
- Define the rotation axis, frame and engineering performance quantities before choosing the rotating method.
- Treat rotor-stator interfaces, periodicity and mesh compatibility as conservation-critical connections.
- For transient interaction, resolve blade-passing timescales and verify timestep sensitivity.
Already have a CFD model that behaves incorrectly?
Start from the symptom and follow the Technical Case diagnostic sequence before tuning unrelated solver controls.
Browse Technical Cases →Build the modelling decision from the underlying physics.
Use the guides for definitions, assumptions, workflow design and evidence requirements.
MRF vs Sliding Mesh in STAR-CCM+
Choose the rotating-flow approximation from the objective
Open resource →ENGINEERING GUIDEWhat is y+ in CFD?
Plan near-wall resolution on blades and passages
Open resource →ENGINEERING GUIDECourant Number, CFL & Time Step
Connect timestep to local flow and moving interfaces
Open resource →Diagnose the failure mode when the solved model disagrees.
Technical Cases are organized around symptoms, likely causes, diagnostic order and controlled fixes.
MRF & Sliding-Mesh Interface Problems
Check frames, interfaces, periodicity and conservation
Open resource →TECHNICAL CASECFD Time-Step Sensitivity
Verify transient rotating-flow resolution
Open resource →TECHNICAL CASETurbulence & Wall-Treatment Mismatch
Align blade-wall resolution with the RANS strategy
Open resource →Challenge the CFD with transparent engineering checks.
Independent calculations help reveal whether the problem is in the physics, inputs, numerical resolution or interpretation.
Continue with the same engineering context.
Move into structured training when you need the complete methodology, or engineering support when the answer depends on the actual project.
Connect adjacent modelling decisions.
Complex CFD problems often cross more than one topic cluster. Continue into the governing issue rather than searching by software menu alone.
Go deeper on the performance quantity or failure mode that controls the engineering decision.
This focused pair adds one engineering guide and one symptom-led Technical Case to the Turbomachinery cluster.
Turbomachinery CFD Performance
Extract mass flow, pressure ratio, torque, shaft power and efficiency with consistent stations, frames, sign conventions and averaging.
Read guide →TECHNICAL CASECFD Torque or Power Is Wrong in Rotating Machinery
Check moment axis, origin, RPM conversion, rotating wall selection, sign, interfaces and cycle averaging before changing flow physics.
Open diagnostic case →