The current classification of turbulent boundary layers over different wall surfaces is based on the effect the roughness has on the mean velocity, via the roughness function ΔU +. Previous hot-wire measurements have shown that turbulent boundary layers over different rough wall surfaces, but with identical ΔU +, contain significant differences in the Reynolds stresses throughout the layer. This suggests that a detailed documentation of the effect of the roughness on the anisotropic Reynolds stress tensor may pave the way for a more general classification. This paper examines experimental (boundary layer) and direct numerical simulation (channel flow) data for the invariants of the Reynolds stress tensor. Although only a limited number of rough surfaces have been examined, the results indicate that, relative to a smooth wall, the roughness reduces the level of anisotropy. This is more prominent for k-type roughnesses, the anisotropic invariant map (AIM) signature of the d-type roughness being closer to that for a smooth surface. In the vicinity of the roughness, the AIM signature varies dramatically, within one roughness wavelength, reflecting the significant changes in the characteristics of the turbulence field.
Experiments in Fluids – Springer Journals
Published: Jul 5, 2002
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera