Ivan Maruŝiĉ
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View article: Defining the mean turbulent boundary layer thickness based on streamwise velocity skewness
Defining the mean turbulent boundary layer thickness based on streamwise velocity skewness Open
A new statistical definition for the mean turbulent boundary layer (TBL) thickness is introduced, based on identification of the wall-normal location where the streamwise velocity skewness changes sign, from negative to positive, in the ou…
View article: Decoupling pressure gradient history effects in turbulent boundary layers through high-Reynolds number experiments
Decoupling pressure gradient history effects in turbulent boundary layers through high-Reynolds number experiments Open
This study provides a carefully controlled examination of the universality of the von Karman and additive constants associated with the classical logarithmic scaling of the mean streamwise velocity profile in high-friction Reynolds number …
View article: A method for evaluating relations of turbulent normal stresses by experimental data over a wide range of Reynolds numbers
A method for evaluating relations of turbulent normal stresses by experimental data over a wide range of Reynolds numbers Open
Recently, Nagib et al. ( Phys. Fluids, vol. 36, no. 7, 2024, 075145) used indicator functions of streamwise normal stress profiles to identify the valid wall-distance and Reynolds number ranges for two models in direct numerical sumulation…
View article: The spectral response of time-resolved PIV in a turbulent boundary layer
The spectral response of time-resolved PIV in a turbulent boundary layer Open
This study presents the application of time-resolved particle image velocimetry (TR-PIV) to measure the mean and fluctuating velocity components in a turbulent boundary layer (TBL) over an axisymmetric body of revolution. A narrow wall-nor…
View article: Straining Flow Effects on Sperm Flagellar Energetics in Microfluidic Cross‐Slot Traps
Straining Flow Effects on Sperm Flagellar Energetics in Microfluidic Cross‐Slot Traps Open
Sperm need to effectively navigate the intricate pathways of the female reproductive tract, which are filled with various complex fluid flows. Despite numerous population‐based studies, the effects of flow on the flagellar beating pattern …
View article: High-fidelity simultaneous measurements of velocity and temperature fluctuations using a dual-wire sensor within thermal boundary layers
High-fidelity simultaneous measurements of velocity and temperature fluctuations using a dual-wire sensor within thermal boundary layers Open
A customised dual-wire sensor, incorporating both a cold-wire and a hot-wire, has been developed to enable simultaneous measurement of temperature and velocity at the same wall-normal location within a thermal boundary layer. This study de…
View article: The Spectral Response of Time-Resolved PIV in a Turbulent Boundary Layer
The Spectral Response of Time-Resolved PIV in a Turbulent Boundary Layer Open
This study presents the application of time-resolved particle image velocimetry (TR-PIV) to measure the mean and fluctuating velocity components in a turbulent boundary layer (TBL) over an axisymmetric body of revolution. A narrow wall-nor…
View article: Defining the mean turbulent boundary layer thickness based on streamwise velocity skewness
Defining the mean turbulent boundary layer thickness based on streamwise velocity skewness Open
A new statistical definition for the mean turbulent boundary layer thickness is introduced, based on identification of the point where the streamwise velocity skewness changes sign, from negative to positive, in the outermost region of the…
View article: Active and inactive contributions to the wall pressure and wall-shear stress in turbulent boundary layers
Active and inactive contributions to the wall pressure and wall-shear stress in turbulent boundary layers Open
A phenomenological description is presented to explain the intermediate and low-frequency/large-scale contributions to the wall-shear-stress ( ${\tau }_w$ ) and wall-pressure ( $\,{p}_w$ ) spectra of canonical turbulent boundary layers, bo…
View article: Turbulent/Non-turbulent Interface in High Reynolds Number Pressure Gradient Boundary Layers
Turbulent/Non-turbulent Interface in High Reynolds Number Pressure Gradient Boundary Layers Open
We report two-dimensional particle image velocimetry experiments in high Reynolds number turbulent boundary layers imposed with a moderately strong streamwise pressure gradient. The unique aspect of these data are the highly resolved measu…
View article: Turbulent/non-turbulent interface in high Reynolds number pressure gradient boundary layers
Turbulent/non-turbulent interface in high Reynolds number pressure gradient boundary layers Open
We report two-dimensional particle image velocimetry experiments in high Reynolds number turbulent boundary layers imposed with a moderately strong streamwise pressure gradient. The unique aspect of these data are the highly resolved measu…
View article: Dynamic mode decomposition for analysis of time-series data
Dynamic mode decomposition for analysis of time-series data Open
Since its publication in 2010, the paper by Schmid ( J. Fluid Mech. , vol. 656, 2010, pp. 5–28) has wielded considerable influence, an impact we examine here. That seminal work introduced dynamic mode decomposition, a method for performing…
View article: A method for evaluating relations of turbulent normal-stresses by experimental data over a wide range of Reynolds numbers
A method for evaluating relations of turbulent normal-stresses by experimental data over a wide range of Reynolds numbers Open
Recently, Nagib et al (2024} utilized indicator functions of profiles of the streamwise normal stress to reveal the ranges of validity, in wall distance and Reynolds number, for each of two proposed models in DNS of channel and pipe flows.…
View article: Evaluation of spatial resolution effects in rough wall-bounded turbulence
Evaluation of spatial resolution effects in rough wall-bounded turbulence Open
This study investigates the impact of insufficient spanwise spatial resolution on the measurement accuracy of streamwise velocity fluctuations over rough walls. We use a direct numerical simulation (DNS) database of turbulent open-channel …
View article: A note on the amplitude modulation phenomenon in non-canonical wall-bounded flows
A note on the amplitude modulation phenomenon in non-canonical wall-bounded flows Open
The amplitude modulation phenomena, defined originally by Mathis et al. (J. Fluid Mech., 628, 311-337; 2009), corresponds to a unique non-linear interaction between Reynolds number ($Re_τ$) dependent large-scale motions and $Re_τ$-invarian…
View article: Evaluation of Spatial Resolution Effects in Rough Wall-bounded Turbulence
Evaluation of Spatial Resolution Effects in Rough Wall-bounded Turbulence Open
This study investigates the impact of insufficient spanwise spatial resolution on the measurement accuracy of streamwise velocity fluctuations over rough walls. We use a direct numerical simulation (DNS) database of turbulent open channel …
View article: Validating Volumetric Measurements Using Helium-Filled Soap Bubbles in a Turbulent Boundary Layer And Wake Of An Axisymmetric Body Of Revolution
Validating Volumetric Measurements Using Helium-Filled Soap Bubbles in a Turbulent Boundary Layer And Wake Of An Axisymmetric Body Of Revolution Open
This study focuses on the validation of a volumetric measurement technique to characterize the turbulent boundary layers (TBL) and wake of a slender axisymmetric body. Specifically, Lagrangian Particle Tracking (LPT) was employed to analys…
View article: Active and inactive contributions to the wall pressure and wall-shear stress in turbulent boundary layers
Active and inactive contributions to the wall pressure and wall-shear stress in turbulent boundary layers Open
A phenomenological description is presented to explain the intermediate and low-frequency/large-scale contributions to the wall-shear-stress ($τ_w$) and wall-pressure (${p}_w$) spectra of canonical turbulent boundary layers, which are well…
View article: Identifying regions of importance in wall-bounded turbulence through explainable deep learning
Identifying regions of importance in wall-bounded turbulence through explainable deep learning Open
Despite its great scientific and technological importance, wall-bounded turbulence is an unresolved problem in classical physics that requires new perspectives to be tackled. One of the key strategies has been to study interactions among t…
View article: High-resolution PIV measurement over wind-generated waves
High-resolution PIV measurement over wind-generated waves Open
The interaction between wind and waves plays a significant role in the exchange of heat, aerosols and gases, thereby influencing our understanding of climate dynamics and air–sea interaction. Particle image velocimetry (PIV) has emerged as…
View article: Characteristics of active and inactive motions in high-Reynolds-number turbulent boundary layers
Characteristics of active and inactive motions in high-Reynolds-number turbulent boundary layers Open
Wall-scaled (attached) eddies play a significant role in the overall drag experienced in high-Reynolds-number turbulent boundary layers (TBLs). This study aims to delve into the underlying mechanisms driving this phenomenon by dissecting t…
View article: Pressure drag reduction via imposition of spanwise wall oscillations on a rough wall
Pressure drag reduction via imposition of spanwise wall oscillations on a rough wall Open
The present study tests the efficacy of the well-known viscous drag reduction strategy of imposing spanwise wall oscillations to reduce pressure drag contributions in transitional and fully rough turbulent wall flow. This is achieved by co…
View article: On the relationship between manipulated inter-scale phase and energy-efficient turbulent drag reduction
On the relationship between manipulated inter-scale phase and energy-efficient turbulent drag reduction Open
We investigate the role of inter-scale interactions in the high-Reynolds-number skin-friction drag reduction strategy reported by Marusic et al. ( Nat. Commun. , vol. 12, 2021). The strategy involves imposing relatively low-frequency strea…