June 15, 2021 Presentation Open Access

Lahooti, Mohsen; Palacios, Rafael; Sherwin, Spencer

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    "description": "<p>An efficient high-fidelity FSI method is developed for aeroelastic simulations of highly deformable streamlined<br>\nstructures in separated flows with a non-constant cross-section over the structure span. The method is the further<br>\ndevelopment of our Nektar++/SHARPy FSI solver [1] to support non-constant sectional geometry over the<br>\nstructural span as well as introducing correction factor for tip loss effect. The FSI solver has implemented in<br>\nNektar++ [2] framework where the Navier-Stokes equation is discretized and solved using the high-order<br>\nspectral/hp element method. Large-Eddy Simulation (LES) method is used to resolve the turbulent structures in<br>\nhighly separated flow condition and accurately predict the fluid forces on the structure. To reduce the<br>\ncomputational cost of LES simulation over the slender structure, the thick-strip method [3] is adopted where the<br>\nfull 3D fluid domain is represented with series of separated smaller domains, each of which has a finite thickness<br>\nin the spanwise direction. Having the finite thickness for the strips enables capturing local 3D wake turbulent<br>\nwhile representing the full 3D domain with a finite number of smaller domains reduces the overall computational<br>\ncost of LES simulation over the slender structure. The thick strips are separated domains that implicitly connected<br>\nvia the structural dynamics. Hence, a correction factor based on the calculated circulation in each strip is<br>\nintroduced to take into account the tip-loss effect. To support independent geometry and meshes for each strip,<br>\nthe hybrid parallelism approach [4] of Nektar++ is further modified which enable having non-constant cross-<br>\nsections over the span. Large-deformation dynamics of the structure is modelled using a geometrically-exact<br>\ncomposite beam finite-element model [5]. Simulation results of deformation of NREL5 MW reference wind<br>\nturbine blade [6] in high angle of attack with large separating flow over the blade is presented and the<br>\ncomputational challenges and requirements for such simulations are discussed in the present research.<br>\nREFERENCES<br>\n[1] M. Lahooti and R. Palacios and S.J. Sherwin, &ldquo;Thick Strip Method for Efficient Large-Eddy Simulations of Flexible<br>\nWings in Stall&rdquo;. In AIAA Scitech 2021 Forum,p. 0363 (2021).<br>\n[2] D. Moxey and C.D. Cantwell and Y. Bao and A. Cassinelli and G. Castiglioni and S. Chun and E. Juda and E. Kazemi,<br>\nand K. Lackhove and J. Marcon and G.Mengaldo, &ldquo;Nektar++: Enhancing the capability and application of high-fidelity<br>\nspectral/hp element methods&rdquo;. Compu. Phys. Commu., 249, p.107110 (2020).<br>\n[3] Y. Bao and R. Palacios and M. Graham and S. Sherwin, &ldquo;Generalized thick strip modelling for vortex-induced<br>\nvibration of long flexible cylinders&rdquo;. J Comput. Phys, 321, pp.1079-1097. (2016).<br>\n[4] A. Bolis, Fourier spectral/hp element method: investigation of time-stepping and parallelisation strategies, PhD<br>\ndissertation, Imperial College London, (2012).<br>\n[5] A. del Carre and A. Mu&ntilde;oz-Sim&oacute;n and N. Goizueta and R. Palacios, &ldquo;SHARPy: A dynamic aeroelastic simulation<br>\ntoolbox for very flexible aircraft and wind turbines.&rdquo;, J. Open Source Softw., 4(44), p.1885. (2019)<br>\n[6] J. Jonkman and S. Butterfield and W. Musial and G. Scott., &ldquo;Definition of a 5-MW reference wind turbine for offshore<br>\nsystem development (No. NREL/TP-500-38060).&rdquo;, National Renewable Energy Lab.(NREL), Golden, CO, United States,<br>\n(2009)</p>", 
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    "title": "High-fidelity aeroelastic simulation of flexible wings inseparated flows", 
    "notes": "My presentation slides at Coupled 2021", 
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        "title": "High performance computing for wind energy", 
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        "program": "Horizon 2020 Framework Programme - Research and Innovation action", 
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    "keywords": [
      "fluid structure interaction, FSI, high-fidelity simulation, LES, DNS, aeroelasticity, wind turbine, wind energy"
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    "publication_date": "2021-06-15", 
    "creators": [
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        "orcid": "0000-0002-9659-7344", 
        "affiliation": "Imperial College London", 
        "name": "Lahooti, Mohsen"
      }, 
      {
        "affiliation": "Imperial College London", 
        "name": "Palacios, Rafael"
      }, 
      {
        "affiliation": "Imperial College London", 
        "name": "Sherwin, Spencer"
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    "meeting": {
      "acronym": "Coupled 2021", 
      "url": "https://congress.cimne.com/Coupled2021/frontal/Objectives.asp", 
      "dates": "13-16 Jun 2021", 
      "session": "High-fidelity methods for Fluid-Structure interaction and Aeroelasticity", 
      "title": "Coupled Problems 21"
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