Seminar Event Detail

Student AIM Seminar

Date:  Friday, March 25, 2022
Location:  Virtual (4:00 PM to 5:00 PM)

Title:  Soft, squishy, submerged: Eulerian simulation of fluid-structure interaction with the lattice Boltzmann reference map technique

Abstract:   The interactions between deformable solids and fluids are present across all scales in many natural, biological, and engineering systems. However, modeling such interactions is not a trivial task due to the dichotomy in the simulation approaches for solids and fluids. I will present a fully Eulerian method for fluid-structure interaction (FSI), lattice Boltzmann reference map technique (LBRMT), which allows both finite-strain solids and fluids to be represented on one fixed computational grid. Our hybrid method simplifies the coupling between both phases without the need for remeshing complex geometries or tracking many discretization frameworks. It also improves the code performance in the fluid update thanks to the lattice Boltzmann (LB) method.

In this talk, I will first overview the reference map technique (RMT) [1] and formulate the finite strain elasticity theory. Then, I will summarize the LB method for the fluid update, explain how we couple the RMT and the LB method for Eulerian simulation of solids and fluids, and introduce the LBRMT algorithm. In the next part, I will walk through the multi-body contact and numerical schemes in the code implementation, demonstrate the accuracy and convergence of the LBRMT with benchmark examples, and show simulation results of sedimentation, flexible rotors, and collective motion. Lastly, I will present our work on artistic stylization [2] of 3D simulation data [3].

[1] C. H. Rycroft, C.-H. Wu, Y. Yu, and K. Kamrin, Reference map technique for incompressible fluid-structure interaction, J. Fluid Mech. 898, A9 (2020).

[2] Y. Sun, Y. L. Lin, N. J. Derr, and C. H. Rycroft, Settling down: simulations of soft immersed rods with the reference map technique, APS Division of Fluid Dynamics Gallery of Fluid Motion, V0045 (2021). (doi:10.1103/APS.DFD.2021.GFM.V0045)

[3] Y. L. Lin, N. J. Derr, and C. H. Rycroft, Eulerian simulation of complex suspensions and biolocomotion in three dimensions, Proc. Natl. Acad. Sci. 119, e2105338118 (2022).


Speaker:  Yue Sun
Institution:  Harvard University

Event Organizer:     


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