Aerodynamic functional diagnostics based on angular momentum transport lines

Xiang I.A. Yang, Vishal Jariwala, Haosen H.A. Xu, Louis Larosiliere

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In analogy with the classical concept of mass-flux-based streamlines, we define Angular Momentum Transport (AMT) lines as an aerodynamic functional diagnostic tool. The AMT lines are the ones whose tangents are given by the average angular momentum flux. The mathematical and physical properties of these AMT lines are exploited to study the generation, removal, and transport of angular momentum in turbomachinery components. We illustrate the concept by visualizing AMT lines in two relatively simple flows, namely, vaneless incompressible diffuser and von Karman flow (a model of centrifugal compressors). Next, we apply the proposed diagnostic tool to flow in a return channel. A return channel is a part of a multistage centrifugal compressor stage. Its principal function is to remove angular momentum. In this work, we apply the diagnostic tool of AMT lines to a Reynolds averaged Navier Stokes simulation (RANS) and a wall-modeled large eddy simulation (LES) of flow in the return channel. We show that AMT lines give us insights into the angular momentum transport process that are otherwise not available with conventional visualization tools.

Original languageEnglish (US)
Title of host publicationTurbomachinery - Design Methods and CFD Modeling for Turbomachinery; Ducts, Noise, and Component Interactions
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791884928
StatePublished - 2021
EventASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition, GT 2021 - Virtual, Online
Duration: Jun 7 2021Jun 11 2021

Publication series

NameProceedings of the ASME Turbo Expo


ConferenceASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition, GT 2021
CityVirtual, Online

All Science Journal Classification (ASJC) codes

  • General Engineering


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