Richard Smith's blog

Heroic Aircraft Design Aided by Caedium CFD

Niklas Wendel and Julia Gundert, students at Thomas-Morus-Gymnasium, Daun, Germany, recently completed a project to envisage an airliner of the future with a focus on sustainability and fuel efficiency. Their project was named HELT, translated as a German acronym for 'High Efficiency Aircraft', and is also similar to the German word 'held' which translates to 'hero' in English. During their early concept design phase they used Caedium Professional to perform Computational Fluid Dynamics (CFD) simulations to evaluate the aerodynamic efficiency of various configurations before selecting their final Blended Wing-Body (BWB) design.

HELT TeamHELT TeamNiklas Wendel and Julia Gundert

Internal Flow with CFD

Just as Computational Fluid Dynamics (CFD) has found extensive use across a wide range of external flow applications, it is also used to simulate a diverse set of internal flow applications.

Wind Tunnel CFD SimulationWind Tunnel CFD SimulationStreamlines colored by velocity magnitude

External Aerodynamics with CFD

Computational Fluid Dynamics (CFD) sees broad use in many applications across a diverse range of industries. No more so is this true than in the applications you'll see for CFD in external aerodynamics analysis.

CFD Simulation of a CityCFD Simulation of a CityAir Velocity Vectors

A Case for Renaming the Navier-Stokes Equations

You probably know that the Navier-Stokes (NS) equations are named after Claude-Louis Navier and George Gabriel Stokes. Navier come up with the first original derivation based on discrete molecular interactions (discrete approach) and Stokes originated the assumption of a continuum directly using viscosity that is the widely referenced approach still taught today. However, between these two approaches there were other derivations, a continuum of sorts, attributed to other luminaries of 19th Century science.

Navier and StokesNavier (left) and StokesRoom for more?

Ludwig Prandtl: Real Fluids Explained

Prior to Ludwig Prandtl (1875 - 1953), analytic analysis of fluids with an early form of Computational Fluid Dynamics (CFD), confined to paper and pencil, assumed ideal inviscid potential flow. However, this approach was less than ideal at predicting drag (d'Alembert's paradox) and airfoil stall, which was a pressing problem for engineers at the dawn of powered heavier-than-air flight. Prandtl developed practical theories for real fluids that found favor with aircraft designers. Also, like Osborne Reynolds before him, Prandtl had a non-dimensional number, the Prandtl Number, named after him.

The Life and Times of Ludwig PrandtlTold by Eberhard Bodenschatz

Osborne Reynolds: A Giant in Fluid Dynamics

If you have performed simulations with industrial Computational Fluid Dynamics (CFD) and thereby solved the Reynolds-Averaged Navier-Stokes (RANS) equations, or if you have compared scaled fluid dynamic experiments with their full size counterparts using the Reynolds Number, then you have benefited from the groundbreaking work of Osborne Reynolds (1842 - 1912).

The Life and Times of Osborne ReynoldsTold by Brian Launder (himself a giant in turbulence modeling)

Sliver Treatment Strategies for CFD

Extremely thin, high-aspect-ratio geometry faces (also known as slivers) can cause problems for meshing and adversely affect Computational Fluid Dynamics (CFD) simulation stability. Learn some strategies to identify and deal with slivers to maximize your CFD productivity.

Sliver SurfaceSliver SurfaceProduces poor surface mesh elements (blue)

How to Fix Small Acute Angles for CFD

Small acute angles in your geometry, such as those found where a tangential surface meets a cylindrical surface, can lead to poor results from your Computational Fluid Dynamics (CFD) simulation. Keep reading to learn how to identify and remedy acute angles.

Small Acute Angled Geometry FeatureSmall Acute Angled Geometry FeatureProduces poor mesh elements

Small Feature Removal for CFD

In preparing geometry for a Computational Fluid Dynamics (CFD) simulation you will sometimes find small geometry features (edges and faces) that are irrelevant for your simulation. To resolve a small irrelevant feature would require a large number of small mesh cells that would be a waste of precious computing resources. Keep reading to find out how to detect and remove such features.

Small Feature Causing Unnecessary Mesh ClusterSmall Feature Causing Unnecessary Mesh Cluster

Fluid Visualization in Nature

On the rare occasions that CFD-ers unhitch from their Matrix and venture outdoors, it is only to see that nature is copying the visualization techniques we take for granted in Computational Fluid Dynamics (CFD).

Flowing Stream Visualization Via SiltFlowing Stream Visualization Via Silt

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