Pressure loss coefficients

For optimal design of machines, engines or other complex flow systems, knowledge of individual components and their interaction is essential. Here pressure loss of components with diverse load points is of great importance. For a dimensionless evaluation  “pressure loss coefficients“ are introduced.


\( \zeta = \frac{\Delta p}{\rho/2 \cdot w^2}\)

These are dependent on the geometry (e.g. valve or damper position), from the Reynolds-number (flow conditions and surface roughness).
To determine pressure loss coefficients with maximum efficiency, we have various well-established 3D-CFD standard processes (for design and optimization) at our disposal.

  • stationary processes (some with partially parameterized geometry)
  • transient processes (with animated geometry)

Partial parameterization of the geometry enables a flexible position (e.g. valve  or damper position) and an automatization of the whole process (geometry, networking, simulation, evaluation).
With our numerical processes we offer you a very efficient and cost-effective methods for determining pressure loss coefficients.  In particular the excellent automatization possibilities of similar geometries contain a wealth of advantages. Moreover, it is possible to measure pressure loss at random positions/cross sections, as well as the resolution of transient effects (even with very small time scales).

Application examples:

  • Inlet and outlet valves (stationary calculations with variable stroke setting)
  • 2-stroke carburetor (stationary calculations with variable throttle position)
  • Intake tract (transient calculations with piston movement)
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