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Spatially moving boundary conditions for FlowFit using the Augmented Lagrangian method

Gesemann, Sebastian (2021) Spatially moving boundary conditions for FlowFit using the Augmented Lagrangian method. Workshop on Optical Metrology and Data Assimilation Applied to Aeroelastics, 22.-23.09.2021, Delft, The Netherlands.

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Official URL: https://omda3.sciencesconf.org/


In order to support Aeroelastics and Fluid-Structure Interaction studies we intend to improve on how the data assimilation method FlowFit deals with possibly moving boundaries such as walls and other objects. FlowFit takes scattered velocity and acceleration estimates from a particle tracking method such as the STB and estimates the full velocity and pressure fields. Internally, FlowFit represents the flow fields using a uniform rectangular grid of base splines. This type of grid has several benefits which include a fast FFT-based Poisson solver for pressure and fast computation of several quantities due to the separability of the filter kernels. But it also complicates the introduction of possibly curved walls. Until now, we have converted wall constraints into a set of “wall particles” covering the wall’s surface with vanishing velocities for the no-slip condition. These constraints were not enforced exactly but only approximately by minimizing the squared error as part of the cost function (penalty method). In this work we present some preliminary results of an investigation on the use of the Augmented Lagrangian method for enforcing the no-slip constraints more accurately within the FlowFit data assimilation method. A 2D implementation of FlowFit was adapted for the purpose of testing different surface sampling strategies with respect to its effect on the velocity field reconstruction.

Item URL in elib:https://elib.dlr.de/145285/
Document Type:Conference or Workshop Item (Speech)
Title:Spatially moving boundary conditions for FlowFit using the Augmented Lagrangian method
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Gesemann, Sebastiansebastian.gesemann (at) dlr.dehttps://orcid.org/0000-0001-9740-5888
Date:September 2021
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Page Range:p. 22
Series Name:Book of Abstracts
Keywords:Data Assimilation, FlowFit
Event Title:Workshop on Optical Metrology and Data Assimilation Applied to Aeroelastics
Event Location:Delft, The Netherlands
Event Type:Workshop
Event Dates:22.-23.09.2021
Organizer:Technische Universität Delft
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Efficient Vehicle
DLR - Research area:Aeronautics
DLR - Program:L EV - Efficient Vehicle
DLR - Research theme (Project):L - Virtual Aircraft and  Validation
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Micknaus, Ilka
Deposited On:26 Nov 2021 15:09
Last Modified:22 Feb 2022 18:28

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