this post was submitted on 04 Jul 2023
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Fluid Mechanics

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AMA! Ph.D. in geophysical fluid mechanics and stratified flows (discuss.tchncs.de)
submitted 2 years ago* (last edited 2 years ago) by jadelord@discuss.tchncs.de to c/fluidmechanics@discuss.tchncs.de
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Hi all! I defended my Ph.D. thesis back in 2019 and I also served as the creator and moderator for the subreddit r/FluidMechanics for a long time. I think with that I have gathered enough experience and courage to answer some of your queries. Some broad topics that I can answer questions on are:

  • computation fluid mechanics
  • scientific programming and HPC
  • nonlinear shallow water equations
  • statistical description of turbulence: spectra, energy budget etc.
  • experimental methods: PIV
  • stratified turbulence
  • academia
  • navigating your career pre- and post-Ph.D.

Ask away!

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[–] elevenant@discuss.tchncs.de 2 points 2 years ago (1 children)

Hi and thanks for doing an AMA! Is fluid dynamics always about solving the Navier-Stokes equation or are there other models as well? I think I remember some article from years ago on progress to analytical solutions of Navier-Stokes. What is the situation there?

[–] jadelord@discuss.tchncs.de 2 points 2 years ago

You're welcome 😀

Navier Stokes is the most common model for most phenomena when the fluid can be assumed to be a continuum. But when

  • it involves particles / multiphase flows / phase change / chemical reactions, extra equations are needed
  • in microsccopic regime (small devices like a DNA sequencing machine) / rarefied regime (hypersonic fluids) the fluid molecules are too far apart, so it is no longer a continuum. Other models like Molecular dynamics or Monte Carlo methods or Lattice Boltzmann methods work best here.
  • in highly turbulent flows, you can't simulate the full Navier Stokes due to limitations in computational resources. Then some turbulence modelling is needed to mimic diffusion at small scales.