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Dr Lei Wu

Lecturer and Chancellor's Fellow

James Weir Fluids Laboratory, Department of Mechanical and Aerospace Engineering,

University of Strathclyde, Glasgow G1 1XJ, UK

lei.wu.100@strath.ac.uk

Presentation
**Assessment and development of the gas kinetic boundary condition for the Boltzmann equation **

Wu L and Struchtrup Henning.

**Non-equilibrium dynamics of dense gas under tight confinement**

Wu L and Liu HH and Reese JM and Zhang YH.

**A kinetic model of the Boltzmann equation for non-vibrating polyatomic gases**

Wu L and White C and Scanlon TJ and Reese JM and Zhang YH.

**Oscillatory rarefied gas flow inside rectangular cavities**

Wu L and Reese JM and Zhang YH.

**Solving the Boltzmann equation deterministically by the fast spectral method: application to gas microflows**

Wu L and Reese JM and Zhang YH.

My recent works may be found in ResearchGate

Due to the technical problems, the following slides cannot be shown. I will try to fix this shortly.

A summary of my work on the fast spectral method from 2012 to 2015

Presentation at 29th International Symposium on Rarefied Gas Dynamics (Xi'an 2014)

Presentaiton at 30th International Symposium on Rarefied Gas Dynamics (Victoria, 2016)

Presentation at 10th International Conference on Computational Physics (Macau 2017)

Selected publications

Wu L and Struchtrup Henning.

*Journal of Fluid Mechanics* **823 **(2017) 511-537.

**On the apparent permeability of porous media in rarefied gas flows**

Wu L and Ho MT and Germanou L and Gu XJ and Liu C and Xu K and Zhang YH.

*Journal of Fluid Mechanics* **822 **(2017) 398–417.

Wu L and Liu HH and Reese JM and Zhang YH.

*Journal of Fluid Mechanics* **794 **(2016) 252–266.

Wu L and White C and Scanlon TJ and Reese JM and Zhang YH.

*Journal of Fluid Mechanics* **763 **(2015)** **24-50

Wu L and Reese JM and Zhang YH.

*Journal of Fluid Mechanics* **748 **(2014) 350-367.

Wu L and Reese JM and Zhang YH.

*Journal of Fluid Mechanics* **746 **(2014) 53-84.

Research interests

- Rarefied Gas Dynamics (Boltzmann equation)

when the mean free path of the gas molecule is comparable or larger than the characteristic flow length, the Conventional Computational Dynamics fails and the kinetic equation must be used to study the rarefied gas dynamics. We are developing an accurate and efficient numerical scheme (fast spectral method) for the Boltzmann equation, which has applicaitons in micro/nano-electromechanical systems.

- Spontaneous/Coherent Rayleigh-Brillouin Scattering

light propagating through the atmosphere is scattered by gas molecules, where the scattered signals contain information (such as temperature) about the atmosphere. This information can be extracted by comparing the experimental spectra with theoretical ones. Our aim is to provide RBS spectra based on the Boltzmann equation of realistic intermoelcualr potentials.

- Shale gas, Multiphase flow, Gas-wall interaction (Enskog equation)

while the Boltzmann equation is a fundamental model for gas dynamics at low pressure, its applicability in a typical shale gas production scenario with high gas pressure becomes problematic. This is because the Boltzmann equation is derived under the assumption that the mean free path is much larger than the molecular dimension, which is violated at extreme large gas pressures. Although the gas pressure is high, the non-equilibrium phenomena exitsts because of the small channel width. We are developing efficient numerical schemes to solve the Enskog equation which describes dense gas/liquid flowing through ultra-tight shale strata.

- Granular flows

an efficient fast spectral method for the generalized Enskog equation has been developed to investigate the exotic dynamics of rapid dense granular flows.