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Transition to Turbulence Series – Transition Scenarios

Motivation: There are various type of instabilities for a number of flow patterns. The intention of this post is to investigate how these instabilities may trigger laminar-turbulent transition. I shall do my best to classify these routes leading from a stable laminar to a disturbed one flow, and base my path on the mechanisms responsible …

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All About CFD – Mapping the Territory – Newsletter 1

My name is Tomer (Tom) Avraham. I have been around fluid dynamics, CFD and Physics in general for the past 20 years. Spent time at work places that I can nothing but own great gratitude for (Israeli Aerospace Industry, Elbit, As head of engineering in Ansys Channel Partner, as a consultant to STAR-CCM+ CP, continued …

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Nonmodal instability of PDE discretizations – Spectra Analysis – An Introduction Primer for ByPass Transition

In this section we're going to pull out a few tools from our analysis arsenal and pay very close attention to what might seem at first like odd results. Doing that would be best on well known basic flows, i.e. Plane Poiseuille, and then Blasius boundary layer, pipe flow and coutte. Plane Poiseuille It is …

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From Reynolds Transport Theorem to Navier-Cauchy to Navier-Stokes Voyage: Part I

There are certain fundamental principles of conservation that govern the implementation of CFD. These principles are Conservation of mass, momentum & energy. We will see how we can represent these principles evolve in a mathematical form that expresses the dynamics of fluid flow by preserving mass, momentum and energy conservation. The Need of Reynolds Transport …

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Classification of 2nd Order PDE in Fluid Flow Application

Partial Differential Equation based on their mathematical behavior can exhibit totally different solution in the flow field. The different and unique behavior of PDEs depends on their characteristics. It is very important to study these characteristics of PDEs so that we can make an assessment of the kind of numerical method should be applicable for …

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