28 citations · 145 across the 16 of their papers we have counts for
16 papers
The role of symmetries in the axisymmetric jet mean velocity profile development
Preben Buchhave, Mengjia Ren, Clara Marika Velte
The fact that physical conservation laws can be derived from symmetry properties of space and time, as shown by Emily Nöther, has been utilized in predicting the development of the…
Dynamic Triad Interactions and Evolving Turbulence -- Part 2: Implications for Practical Signals
Preben Buchhave, Clara Velte
We investigate how momentum and kinetic energy is transferred between Fourier components (the so-called triad interactions) in measured turbulent flow fields, i.e. in practical, di…
Triad interactions investigated by dual vortex shedding
Preben Buchhave, Mengjia Ren, Clara Marika Velte
The study of the exchange of momentum and energy between wave components of the turbulent velocity field, the so-called triad interactions, offers a unique way of visualizing and d…
Similarity scaling of the axisymmetric turbulent jet
Chunyue Zhu, Yujia Tian, Preben Buchhave +1
In the current work, we find that a free axisymmetric jet in air displays self-similarity in the fully developed part of the jet. We report accurate measurements of first, second a…
A similarity scaling model for the axisymmetric turbulent jet based on first principles
Preben Buchhave, Clara M. Velte
Similarity scaling, when it can be justified, is a powerful tool for predicting properties of fluid flows and reducing the computational load when using mathematical models. Numero…
Understanding developing turbulence by a study of the nonlinear energy transfer in the Navier-Stokes equation
Preben Buchhave, Clara Marika Velte
In the present work, we investigate a numerical one-dimensional solver to the Navier-Stokes equation that retains all terms, including both pressure and dissipation. Solutions to s…
Experimental investigation of the turbulent cascade development by injection of single large-scale Fourier modes
Margherita Dotti, Rasmus Korslund Schlander, Preben Buchhave +1
The current work presents an experimental investigation of the dynamic interactions between flow scales caused by repeated actions of the nonlinear term of the Navier-Stokes equati…
Measurement of turbulent spatial structure and kinetic energy spectrum by exact temporal-to-spatial mapping
Preben Buchhave, Clara M. Velte
We present a method for converting a time record of turbulent velocity measured at a point in a flow to a spatial velocity record consisting of consecutive convection elements. The…
Reduction of noise and bias in randomly sampled power spectra
Preben Buchhave, Clara M. Velte
We consider the origin of noise and distortions in power spectral estimates of randomly sampled data, specifically velocity data measured with a burst-mode laser Doppler anemometer…
The effect of dead time on randomly sampled power spectral estimates
Preben Buchhave, Clara M. Velte, William K. George
We investigate power spectra of a randomly sampled stationary stochastic signal, e.g. a spatial component of a turbulent velocity. We extend the methods of previous authors that ba…
Dead time effects in laser Doppler anemometry measurements
Clara M. Velte, Preben Buchhave, William K. George
We present velocity power spectra computed by the so-called direct method from burst type laser Doppler anemometer (LDA) data, both measured in a turbulent round jet and generated…
Estimation of burst-mode LDA power spectra
Clara M. Velte, William K. George, Preben Buchhave
The estimation of power spectra from LDA data provides signal processing challenges for fluid dynamicists for several reasons: acquisition is dictated by randomly arriving particle…
Dynamic Triad Interactions and Evolving Turbulence -- Part 1: 4D Modal Interactions
Preben Buchhave, Clara M. Velte
We investigate the effect of a four-dimensional Fourier transform on the formulation of the Navier-Stokes equation in Fourier space and the way the energy is transferred between Fo…
A novel laser Doppler anemometer (LDA) for high-accuracy turbulence measurements
Mohd Rusdy Yaacob, Rasmus Korslund Schlander, Preben Buchhave +1
High accuracy and dynamic range have been some of the most prominent challenges when it comes to fine-scale turbulence measurements. The current commercial LDA processors, which pe…
Generation of Polarization Squeezing with Periodically Poled KTP at 1064 nm
Mikael Lassen, Metin Sabuncu, Preben Buchhave +1
We report the experimental demonstration of directly produced polarization squeezing at 1064 nm from a type I optical parametric amplifier (OPA) based on a periodically poled KTP c…
Squeezing based on nondegenerate frequency doubling internal to a realistic laser
Ulrik L. Andersen, Peter Tidemand-Lichtenberg, Preben Buchhave
We investigate theoretically the quantum fluctuations of the fundamental field in the output of a nondegenerate second harmonic generation process occuring inside a laser cavity. D…