Produce a comparison report

Put two or more studies of the same body side by side, and answer the two questions a reviewer will ask: does the result depend on the mesh, and does it depend on the turbulence model.

Runs on the free tier; the PDF is watermarked.

Add a second simulation

A case is one body and any number of studies of it, so the geometry is shared and only the study is duplicated.

• Add a simulation at the bottom of the setup tree, or Model → SIMULATION → New simulation, and answer the dialog.
• Or use ⋯ on a simulation header in the tree and choose Duplicate, then change the one thing you are testing. Rename… it to say what that is.

For mesh independence, change Base cell size under Mesh (or the levels under Refinements) and nothing else. For model dependence, change Model under Models and nothing else. Changing two things at once produces a difference you cannot attribute.

Mesh and run each simulation.

Changing one thing at a time by hand is still the right method for two or three studies. Past that, the Study node beside Comparison builds the matrix for you — see run a parameter study or a DoE.

Read the comparison

Select Comparison in the tree. It appears once there is more than one simulation.

Each study gets a block showing Solver, Turbulence, Cells, Base cell, Target y+ and Iterations, with its outcome beside the name. A study that has not been run says not run rather than showing a blank — which is the entry that matters most when a comparison looks too good. Open this simulation switches to it.

Every figure is read back out of the stored models rather than recomputed, so it reports what each study actually did.

If the case is an incidence sweep, the Incidence sweep section adds the stated findings — lift-curve slope, Cl max, pitching-moment slope and the neutral point — above the Cl, Cd, Cm and drag-polar plots.

If any part carries a force and moment control, Component loads reports force and moment on each named part about the reference point its control was given, and shaft power where there is a shaft. That is the payoff of splitting the geometry into parts.

Add your own quantities

Derived quantities turns coefficients into whatever your machine actually needs. Press + Add a derived quantity, name it, write the expression and give it a Unit — the unit is a label and is not checked against the expression. What you can use in an expression lists every symbol with its current value; click a name to copy it.

Export it

Press Export comparison report. One PDF: the comparison table, then each study's own setup and results. The single-run report is under Simulation runs > <run name> > Report — inside each run, not each simulation, because a study with three runs has three of them.

Check it worked

• Every study you meant to include shows an outcome, not not run.
• The quantity you care about is either stable across the meshes — in which case you have a mesh-independent result — or it is not, and you need a finer one.
• The path to the written PDF appears under the button.

Mesh independence, and why a single run cannot answer either question: Concepts.