Richard Smith's blog

6 Things to Consider Before Switching Turbulence Model

Turbulence modeling for the Reynolds Averaged Navier-Stokes (RANS) equations - the basis of most industrial Computational Fluid Dynamics (CFD) software - is a complex field. Trying to strike a balance between accuracy and computational efficiency has given rise to a relatively large number of different turbulence models. I am not aware of a definitive list to match turbulence models to applications - if you are, please share! With this in mind I'll share 6 suggestions before you consider switching the default turbulence model in your CFD software.

RANS Simulation of Air Flow Around a ChimneyRANS CFD Simulation of Air Flow Around a ChimneyUsing the k-omega SST turbulence model

CFD Simulation Steering

You've already heard some of the advantages of using co-processing over after-the-fact post-processing, but there's more. Co-processing is an enabler of Computational Fluid Dynamics (CFD) simulation 'steering', i.e., making changes to the simulation while it is active.

CFD Simulation Steering in CaediumCFD Simulation Steering in CaediumRelaxation factors changed at 200 iterations

Why Compromise with Browser-Based CAD/CAE Applications?

Why is there an ongoing effort to cram rich interactive 3D CAD/CAE applications into a web browser for desktop and laptop computers yet there is a proliferation of dedicated apps on tablets and smart phones?

Avoid CFD Transient Data Overload with Co-Processing

Computational Fluid Dynamics (CFD) has the potential to overwhelm any computer, including the largest super computers, with generated flow field data (e.g., pressure, velocity) for transient (time dependent or time accurate) simulations. The traditional approach to transient simulations, and still widely used today, is to run a transient simulation and store entire flow field data sets at each time step for post processing at a later date. Given that a transient simulation can run for 10,000s of time steps, data management clearly becomes a significant issue, or more often a headache. However, there is an elegant alternative - co-processing.

CFD Co-Processing for a Transient Simulation in CaediumCFD Co-Processing for a Transient Simulation in Caedium

5 Tips for CFD Flow Volume Creation

Configuring a flow volume for Computational Fluid Dynamics (CFD) is often the most difficult task during the simulation process. Follow these 5 tips to make your CFD flow volume creation less painful.

3D Model With Too Much Detail For CFD3D Model With Too Much Detail for CFD

CFD Flow Volumes and Solid Models

Solid modeling is the dominant form of virtual object representation underpinning nearly all 3D Computer-Aided Design (CAD) systems. The strength of a solid model is that it defines a water tight (manifold) unambiguous object which implicitly delineates between the inside and the outside of an object simply by the alignment of the boundaries (B-rep or BREP) that define it. This makes solid modeling an ideal basis for virtual analysis techniques, e.g., stress analysis and Computational Fluid Dynamics (CFD). Also solid modeling provides a relatively straightforward path to manufacture through CNC machines and, more recently, 3D printing.

Cylinder Head Solid ModelCylinder Head Solid ModelBoundary Representation (B-rep or BREP)

Sports, Fluid Flow, and Spheres

Given how easy it is to define a sphere with a single value (radius) you'd think the fluid flow around a sphere would be simple too, right? However, as with many innocuous looking fluid problems, our intuition is wrong. The resulting flow characteristics, especially the drag variation with fluid velocity, are wild. Why does this matter? One word - sports.

CFD Simulation of Flow Around a SphereCFD Simulation of Flow Around a SphereReynolds number 10,000, large unsteady asymmetric recirculation

Laminar vs Turbulent Flow Over Airfoils

Which is more efficient: laminar or turbulent flow over an airfoil? Find out in this simple Computational Fluid Dynamics (CFD) study.

CFD Simulation of Laminar Flow Over An AirfoilCFD Simulation of Laminar Flow Over An AirfoilVelocity Magnitude Contours

12 CFD Tips for a Productive New Year

To make best use of Computational Fluid Dynamics (CFD) software there are a number of key concepts to keep in mind. Based on my experiences and those of Caedium Professional users here's a selection of the important issues to consider while you prepare and perform your own CFD simulations.

Caedium Professional  CFD SimulationCaedium Professional CFD Simulation

Underwater Kites Generate Electricity

There are some fascinating proposals for power generation using tethered kites and balloons, so why not investigate the equivalent of underwater kites for generating power? Why not indeed, because that is exactly what two independent teams of researchers are doing, one from Minesto, Sweden and the other from Worcester Polytechnic Institute, USA [Source: Discovery News].

Minesto Underwater Kite

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