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Seminar: Direct Numerical Simulation of Compressible Turbulent Flows Over Rough and Porous Walls

Event Details:

  • Date:          Tuesday, 12 July 2022
  • Time:         Starts: 16:00
  • Venue:       This is an online-only, public event.  You may connect to our live stream of the discussion, available on Zoom (Password: VsSCz1)
  • Speaker:    Assistant Professor Davide Modesti, Faculty of Aerospace Engineering, Delft University of Technology



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CaSToRC, the HPC National Competence Centre,
 invites you to the EuroCC and SimEA Seminar Series



 

Abstract

The talk will focus on the flow physics of compressible turbulent flows over rough and porous walls. In the first part of the seminar, we will present pore-resolved direct numerical simulations (DNS) of turbulent flows over perforated plates, which are representative of the acoustic liners found on aircraft engines, figure 1(a). We will focus on the aerodynamic drag induced by acoustic liners, and their similarities and differences with rough surfaces. In particular, we will show that acoustic liners can be regarded as porous surfaces, and in operating conditions they work in the fully rough regime.
In the second part of the talk, we will analyse the flow physics of supersonic turbulent flows over rough walls (figure 1b), which are typical of heat shields of high-speed vehicles. Using results of recent DNS, we will discuss compressibility effects on added drag and heat transfer, which have relevant implications for modeling of turbulent high-speed flows.

figure

Figure 1: (a) Turbulent structures in channel flow over acoustic liners at friction Reynolds number Reτ ≈ 2000 and bulk Mach number Mb = 0.3. (b) Instantaneous streamwise velocity (wall-parallel plane) and temperature (cross-stream planes) in turbulent channel flow over cubical roughness at Mb = 4 and Reτ ≈ 1000.

 

About the Speaker

davide modestiDavide Modesti is an Assistant Professor in the Faculty of Aerospace Engineering at Delft University of Technology. He received his PhD in Theoretical and Applied Mechanics from La Sapienza Università di Roma in 2017, where he carried out direct numerical simulations (DNS) of compressible wall-bounded flows at high Reynolds number.

After completing his PhD, he has been a Research Fellow at DynFluid laboratory in Paris and at the University of Melbourne, before joining TU Delft in 2020. His research focuses on high-fidelity simulations of compressible wall-bounded turbulent flows, and on the development of numerical methods for computational fluid dynamics.

 


 

Download the Summer 2022 EuroCC & SimEA Seminar Series Programme here.

Screenshot 2022 04 12 165256 


 

The EuroCC project has received funding from the European Union’s Horizon 2020 research and innovation programme grant agreement No. 951732

European Union's Horizon 2020 Research and Innovation Programme

The SimEA project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 810660

 


 

The seminar will be in English and the event is open to the public.
This is an online-only, public event.  You may connect to our live stream of the discussion, available on Zoom (Password: VsSCz1).
Images and/or recordings of our open public events may be used by The Cyprus Institute for dissemination purposes including print and digital media such as websites, press-releases, social media, and live streaming.

 



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Additional Info

  • Date: Tuesday, 12 July 2022
  • Time: Starts: 16:00
  • Speaker: Assistant Professor Davide Modesti, Faculty of Aerospace Engineering, Delft University of Technology