Options for Dynamic Similarity of Interacting Fluids, Elastic Solids and Rigid Bodies Undergoing Large Motions

Huan Liu, Kalpesh Jaykar, Vinitendra Singh, Ankit Kumar, Kevin Sheehan, Peter Yip, Philip Buskohl, Richard D. James

Research output: Contribution to journalArticlepeer-review


Motivated by a design of a vertical axis wind turbine, we present a theory of dynamical similarity for mechanical systems consisting of interacting elastic solids, rigid bodies and incompressible fluids. Throughout, we focus on the geometrically nonlinear case. We approach the analysis by analyzing the equations of motion: we ask that a change of variables take these equations and mutual boundary conditions to themselves, while allowing a rescaling of space and time. While the disparity between the Eulerian and Lagrangian descriptions might seem to limit the possibilities, we find numerous cases that apparently have not been identified, especially for stiff nonlinear elastic materials (defined below). The results appear to be particularly adapted to structures made with origami design methods, where the tiles are allowed to deform isometrically. We collect the results in tables and discuss some particular numerical examples.

Original languageEnglish (US)
JournalJournal of Elasticity
StateAccepted/In press - 2023

Bibliographical note

Funding Information:
The research at UMN was supported by the MURI program (FA9550-18-1-0095 and FA9550-16-1-0566) and a Vannevar Bush Faculty Fellowship. P.B. and K.S. were supported by the LUCI project, “Phase Transition-Assisted Optimization in Bifurcated Design Spaces”.

Publisher Copyright:
© 2023, The Author(s), under exclusive licence to Springer Nature B.V.


  • Continuum mechanics
  • Dynamic similarity
  • Fluid-structure interaction
  • Material selection
  • Scaling laws
  • Wind turbines


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