Fidelity™ Flow Pressure-based Solver

NUMECA is now Cadence

Born from the exclusive joint-venture between Cadence and coupledNumerics, Fidelity™ Flow Pressure-based Solver widens the range of applications with fast and robust convergence for low-speed and incompressible flows.

Low-Speed Aerodynamics

Thanks to the simultaneous solution of momentum and continuity equations, with an implicit block coupling of pressure and velocity variables, the Pressure-based solver yields faster convergence compared to classical, loosely coupled, segregated pressure-based solvers.

This gain in convergence speed is accompanied by an improvement in numerical robustness for regimes ranging from low-speed to transonic and supersonic regimes.

The new technology has proved to be an invaluable resource for simulating the flow in a large number of applications, such as automotive, low-speed aircraft, drones and gliders, piping systems, heat exchangers, fans, hydraulic turbomachinery, …

Conjugate Heat Transfer and thermal management

The segregated formulation of the energy equation and the implicit treatment at the fluid-solid connections, allow the use of specific solving times or relaxation for the solid domains with an improved acceleration of the convergence for applications involving conjugate heat transfer.

Application examples:

  • Heat exchanger
  • Automotive thermal management
  • Cooling systems
  • Electric motor
  • HVAC
  • ...

Conjugate Heat Transfer of a water cooling jacket

Low speed rotating machinery

Gamm turbine

The coupled pressure-based solver is known to be more efficient for low-speed flow, thanks to the fully implicit pressure-velocity coupling algorithms. With multidomain capacities and multiple reference frames, a large range of low speed rotating machinery applications is efficiently solved with the coupled solver.

Application examples:

  • ​Fans
  • Thermal turbomachinery
  • Hydro turbines
  • Pumps
  • ...

Unsteady flows

Thanks to its implicit, second-order accuracy time marching algorithms, Fidelity™ Flow exhibits excellent simulation speed for solving unsteady problems.

It supports multiple functionalities such as buoyancy, heat source terms, heat transfer...

Forced convection cooling of an electronic chip - steady-state computation (1250 RPM)

Key Features

Fidelity™ Automesh Hexpress:

  • Full Hexahedral Grids 
  • Direct CAD import capabilities
  • CAD manipulation and decomposition tools
  • Mesh wizard for rapid solution set-up and easy back and forth operation
  • Buffer cell and boundary layer insertion
  • Automatic refinement procedures 
  • Multi domain capabilities allowing the treatment of CHT and multi-part geometry models
  • Full non-matching multi-block connection, allowing multi-row turbomachinery meshing

Pressure-based Solver:

  • Incompressible flow
  • Compressible flow (from subsonic to supersonic)
  • Steady and unsteady regimes
  • Laminar and turbulent flows
  • Multidomain capacity
  • Conjugate heat transfer
  • Heat source terms
  • Fluid/fluid mixing plane
  • Multiple reference frame
  • Buoyancy


  • Multi-projects and multi-views graphical user interface
  • Python scripting technology
  • Surface and 3D local value
  • Iso-lines
  • Color contour
  • Vector
  • Iso-surfaces
  • Cloud of particles
  • Line chart
  • Integral
  • Formula and operator derived quantities
  • Live co-processing


Subscribe to our newsletter to learn about the latest technical advancements, events, webinars, and more!