Practical tools for computational fluid dynamics engineers and researchers — built for real-world workflows. Fast, accurate, and no fluff.
Estimate flow regimes, set turbulence boundary conditions, and determine wall spacing — all before opening your solver.
Determine the Reynolds number and flow regime for internal and external flows. Supports arbitrary duct cross-sections via hydraulic diameter, circular pipes, flat plates, and more.
Set inlet turbulence boundary conditions for RANS solvers. Converts intuitive parameters — turbulence intensity and length scale — into the solver-required variables k, ε, ω, and eddy viscosity ratio.
Calculate y⁺ values and determine the required first cell height to achieve your target y⁺ for wall-bounded flows. Works for both internal duct flows and external boundary layers.
Compute the full suite of non-dimensional numbers used in fluid mechanics and heat transfer. Scale experiments, generalize results across fluids and geometries, and establish dynamic similarity between model and prototype.
All formulas are documented with references to standard CFD textbooks and NASA technical reports.
We're continuously adding new CFD tools. Request a calculator or suggest a formula you'd like to see included.