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Model reduction of traveling-wave problems via Radon cumulative distribution transform (2021)
Journal Article
Wolf, W. R., Ren, J., Wolf, W. R., & Mao, X. (2021). Model reduction of traveling-wave problems via Radon cumulative distribution transform. Physical Review Fluids, 6(8), Article L082501. https://doi.org/10.1103/PhysRevFluids.6.L082501

Traveling-wave problems, due to their sizable Kolmogorov n-width, have brought critical challenges to conventional model reduction techniques. This study aims to provide insights into this problem by exploiting the Radon cumulative distribution trans... Read More about Model reduction of traveling-wave problems via Radon cumulative distribution transform.

Molecular dynamics simulation of liquid argon flow in a nanoscale channel (2021)
Journal Article
Sun, Q., Zhao, Y., Choi, K., & Mao, X. (2021). Molecular dynamics simulation of liquid argon flow in a nanoscale channel. International Journal of Thermal Sciences, 170, Article 107166. https://doi.org/10.1016/j.ijthermalsci.2021.107166

The convective heat transfer in the Micro/ Nanoscale channel is of significant importance in engineering applications, and the classical macroscopic theory is invalid at depicting its physical processes and mechanisms. In this study, molecular dynami... Read More about Molecular dynamics simulation of liquid argon flow in a nanoscale channel.

Reduction of atomistic ice tensile stress by graphene–carbon nanotube coating (2021)
Journal Article
Sun, Q., Zhao, Y., Choi, K., Hou, X., & Mao, X. (2021). Reduction of atomistic ice tensile stress by graphene–carbon nanotube coating. Applied Surface Science, 565, Article 150562. https://doi.org/10.1016/j.apsusc.2021.150562

The accumulation of ice has adverse effects on human activities on the ground and in the air while the dynamic mechanism of the interaction force between the ice and wall surface has not been fully explored. Herein, molecular dynamics (MD) simulation... Read More about Reduction of atomistic ice tensile stress by graphene–carbon nanotube coating.

A hybrid solution for offshore wind resource assessment from limited onshore measurements (2021)
Journal Article
Elshafei, B., Peña, A., Xu, D., Ren, J., Badger, J., Pimenta, F. M., …Mao, X. (2021). A hybrid solution for offshore wind resource assessment from limited onshore measurements. Applied Energy, 298, Article 117245. https://doi.org/10.1016/j.apenergy.2021.117245

In wind resource assessments, which are critical to the pre-construction of wind farms, measurements by LiDARs or masts are a source of high-fidelity data, but are expensive and scarce in space and time, particularly for offshore sites. On the other... Read More about A hybrid solution for offshore wind resource assessment from limited onshore measurements.

Molecular dynamics simulation of thermal de-icing on a flat surface (2021)
Journal Article
Sun, Q., Zhao, Y., Choi, K., & Mao, X. (2021). Molecular dynamics simulation of thermal de-icing on a flat surface. Applied Thermal Engineering, 189, Article 116701. https://doi.org/10.1016/j.applthermaleng.2021.116701

The accumulation of ice has adverse effects on human activities but the dynamic mechanism of icing and de-icing has not been well clarified. Herein, molecular dynamics (MD) simulations and the analysis methods of the hydrogen bond and the tetrahedral... Read More about Molecular dynamics simulation of thermal de-icing on a flat surface.

Image-based flow decomposition using empirical wavelet transform (2020)
Journal Article
Ren, J., Mao, X., & Fu, S. (2021). Image-based flow decomposition using empirical wavelet transform. Journal of Fluid Mechanics, 906, Article A22. https://doi.org/10.1017/jfm.2020.817

We propose an image-based flow decomposition developed from the two-dimensional (2-D) tensor empirical wavelet transform (EWT) (Gilles, IEEE Trans. Signal Process., vol. 61, 2013, pp. 3999-4010). The idea is to decompose the instantaneous flow data,... Read More about Image-based flow decomposition using empirical wavelet transform.

An analytical solution of convective heat transfer in microchannel or nanochannel (2020)
Journal Article
Sun, Q., Choi, K., & Mao, X. (2020). An analytical solution of convective heat transfer in microchannel or nanochannel. International Communications in Heat and Mass Transfer, 117, Article 104766. https://doi.org/10.1016/j.icheatmasstransfer.2020.104766

The two-dimensional energy equation with a first-order velocity slip model and a temperature jump model is studied analytically and a solution consisting of an infinite series is obtained. Impacts of viscous dissipation, axial conduction and rarefied... Read More about An analytical solution of convective heat transfer in microchannel or nanochannel.

Resistance of velocity slip flow in pipe/channel with a sudden contraction (2020)
Journal Article
Sun, Q., Choi, K. S., Zhao, Y., & Mao, X. (2020). Resistance of velocity slip flow in pipe/channel with a sudden contraction. Physics of Fluids, 32(6), https://doi.org/10.1063/5.0009415

© 2020 Author(s). A novel approach based on the local entropy generation rate, also known as the second law analysis (SLA), is proposed to compute and visualize the flow resistance in mass transfer through a pipe/channel with a sudden contraction com... Read More about Resistance of velocity slip flow in pipe/channel with a sudden contraction.

New method to capture traveling waves in flow passing a wind turbine (2019)
Journal Article
Le Clainche, S., Mao, X., & Vega, J. M. (2019). New method to capture traveling waves in flow passing a wind turbine. Wind Energy, 22(7), 922-931. https://doi.org/10.1002/we.2331

© 2019 John Wiley & Sons, Ltd. Flow structures in the wake of a wind turbine are analysed by performing spatio-temporal Koopman decomposition (STKD). STKD is a new method to decompose the flow field as a combination of travelling waves and to extra... Read More about New method to capture traveling waves in flow passing a wind turbine.

Low-frequency selectivity in flat-plate boundary layer with elliptic leading edge (2019)
Journal Article
Wang, B., Mao, X., & Zaki, T. A. (2019). Low-frequency selectivity in flat-plate boundary layer with elliptic leading edge. Journal of Fluid Mechanics, 866, 239-262. https://doi.org/10.1017/jfm.2019.91

Linear perturbation analyses of zero-pressure-gradient boundary layers at subcritical Reynolds numbers predict that transient disturbance amplification can take place due to the lift-up mechanism. Upstream, streamwise-elongated vortices yield the lar... Read More about Low-frequency selectivity in flat-plate boundary layer with elliptic leading edge.

Far-wake meandering induced by atmospheric eddies in flow past a wind turbine (2018)
Journal Article
Mao, X., & Sørensen, J. (2018). Far-wake meandering induced by atmospheric eddies in flow past a wind turbine. Journal of Fluid Mechanics, 846, https://doi.org/10.1017/jfm.2018.275

A novel algorithm is developed to calculate the nonlinear optimal boundary perturbations in three-dimensional incompressible flow. An optimal step length in the optimisation loop is calculated without any additional calls to the Navier-Stokes equatio... Read More about Far-wake meandering induced by atmospheric eddies in flow past a wind turbine.

Coherent structures in the breakdown bubble of a vortex flow (2018)
Journal Article
Paterson, O., Wang, B., & Mao, X. (2018). Coherent structures in the breakdown bubble of a vortex flow. AIAA Journal, 56(5), https://doi.org/10.2514/1.J055329

Helical structures downstream of the breakdown-bubble of the Grabowski vortex profile at Reynolds numbers Re< or = 500 have been extensively studied through stability analysis in the literature. However, the low-frequency coherent structures inside t... Read More about Coherent structures in the breakdown bubble of a vortex flow.

Optimal transient growth on a vortex ring and its transition via cascade of ringlets (2017)
Journal Article
Mao, X., & Hussain, F. (2017). Optimal transient growth on a vortex ring and its transition via cascade of ringlets. Journal of Fluid Mechanics, 832, 269-286. https://doi.org/10.1017/jfm.2017.675

Linear and nonlinear transient growths of perturbations on a vortex ring up to Reynolds number (≡ circulation/viscosity) Re=27,000 are studied. For short time intervals, perturbations around the ring axis undergo the strongest linear transient growth... Read More about Optimal transient growth on a vortex ring and its transition via cascade of ringlets.

Transition induced by linear and nonlinear perturbation growth in flow past a compressor blade (2017)
Journal Article
Mao, X., Zaki, T., Sherwin, S., & Blackburn, H. (2017). Transition induced by linear and nonlinear perturbation growth in flow past a compressor blade. Journal of Fluid Mechanics, 820, https://doi.org/10.1017/jfm.2017.240

Flow past a NACA 65 blade at chord-based Reynolds number 138;500 is studied using stability analysis, generalised (spatially weighted) transient growth analysis and direct numerical simulations (DNS). The mechanisms of transition on various sections... Read More about Transition induced by linear and nonlinear perturbation growth in flow past a compressor blade.

Nonlinear optimal suppression of vortex shedding from a circular cylinder (2015)
Journal Article
Mao, X., Blackburn, H., & Sherwin, S. (2015). Nonlinear optimal suppression of vortex shedding from a circular cylinder. Journal of Fluid Mechanics, 775, 241-265. doi:10.1017/jfm.2015.304

This study is focused on two- and three-dimensional incompressible flow past a circular cylinder for Reynolds number Re equal or less than 10000. To gain insight into the mechanisms underlying the suppression of unsteadiness for this flow we determin... Read More about Nonlinear optimal suppression of vortex shedding from a circular cylinder.