Zhenhua Xia
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View article: Precipitation Changes on the Northern Slope of the Kunlun Mountains in the Past 42 Years
Precipitation Changes on the Northern Slope of the Kunlun Mountains in the Past 42 Years Open
The precipitation on the northern slope of the Kunlun Mountains significantly impacts the green economy of the Tarim Basin’s southern edge. Observations have noted an expansion of the surface water area in this region, though the reasons f…
View article: Potential evapotranspiration determines changes in the carbon sequestration capacity of forest and grass ecosystems in Xinjiang, Northwest China
Potential evapotranspiration determines changes in the carbon sequestration capacity of forest and grass ecosystems in Xinjiang, Northwest China Open
Accurately understanding carbon stock in forest and grass ecosystems, determining carbon sequestration capacity (CSC), and identifying influencing factors over time are crucial for regional carbon budget assessment. This paper studied chan…
View article: Diabetes risk prediction model based on community follow-up data using machine learning
Diabetes risk prediction model based on community follow-up data using machine learning Open
Diabetes is a chronic metabolic disease characterized by hyperglycemia, the follow-up management of diabetes patients is mostly in the community, but the relationship between key lifestyle indicators in community follow-up and the risk of …
View article: Distilling experience into a physically interpretable recommender system for computational model selection
Distilling experience into a physically interpretable recommender system for computational model selection Open
Model selection is a chronic issue in computational science. The conventional approach relies heavily on human experience. However, gaining experience takes years and is severely inefficient. To address this issue, we distill human experie…
View article: Three-dimensional sedimentation patterns of two interacting disks in a viscous fluid
Three-dimensional sedimentation patterns of two interacting disks in a viscous fluid Open
The sedimentation of two spherical solid objects in a viscous fluid has been extensively investigated and well understood. However, a pair of flat disks (in three dimensions) settling in the fluid shows more complex hydrodynamic behaviors.…
View article: A Garbage Classification Method Based on a Small Convolution Neural Network
A Garbage Classification Method Based on a Small Convolution Neural Network Open
To improve the efficiency of social garbage classification, a garbage classification method based on a small convolutional neural network (CNN) is proposed in this paper. For low accuracy caused by light and shadow interference, an adaptiv…
View article: Erratum: Central mean temperature scaling in compressible turbulent channel flows with symmetric isothermal boundaries [Phys. Rev. Fluids <b>7</b>, 044606 (2022)]
Erratum: Central mean temperature scaling in compressible turbulent channel flows with symmetric isothermal boundaries [Phys. Rev. Fluids <b>7</b>, 044606 (2022)] Open
Received 7 August 2022DOI:https://doi.org/10.1103/PhysRevFluids.7.089901©2022 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasCompressible boundary layersCompressible flowsHigh-speed flowTurbulenceFluid Dynamics
View article: Post-fire Bond Behaviors Between Grout and Steel Rebar
Post-fire Bond Behaviors Between Grout and Steel Rebar Open
Firstly, according to the theoretical analysis, the force mechanism and failure modes were assured for the bond behavior between grout and steel rebar. Then, a pull-out experiment was exerted to probe the bond behavior developments of spec…
View article: Enhancing large-scale motions and turbulent transport in rotating plane Poiseuille flow
Enhancing large-scale motions and turbulent transport in rotating plane Poiseuille flow Open
Based on the properties of large-scale plume currents, an injection/suction control strategy is introduced to enhance the strength of plume currents and the turbulent transport of passive scalar in rotating plane Poiseuille flow. The contr…
View article: Efficient Local Level Set Algorithm Combined with Bidirectional Evolutionary Criterion Using Discrete Variables and its Appliance to Topology and Shape Optimization
Efficient Local Level Set Algorithm Combined with Bidirectional Evolutionary Criterion Using Discrete Variables and its Appliance to Topology and Shape Optimization Open
Many level set methods (LSMs) have been used for topology and shape optimization. An efficient topology optimization algorithm is proposed by combining a new bi-directional evolutionary criterion (BEC) with the local LSM (LLSM). The BEC is…
View article: Capturing the baroclinic effect in non-Boussinesq gravity currents
Capturing the baroclinic effect in non-Boussinesq gravity currents Open
Direct numerical simulations of two-dimensional gravity currents with small and medium density variations are performed using different non-Boussinesq buoyancy approximations. Taking the full low-Mach-number approximation as the reference,…
View article: Analysis on numerical stability and convergence of RANS turbulence models from the perspective of coupling modes
Analysis on numerical stability and convergence of RANS turbulence models from the perspective of coupling modes Open
Reynolds-averaged Navier-Stokes simulations are still the main method to study complex flows in engineering. However, traditional turbulence models cannot accurately predict flow fields with separations. In such situation, machine learning…
View article: Exact mathematical formulas for wall-heat flux in compressible turbulent channel flows
Exact mathematical formulas for wall-heat flux in compressible turbulent channel flows Open
In this paper, several exact expressions for the mean heat flux at the wall ($q_w$) for the compressible turbulent channel flows are derived by using the internal energy equation or the total energy equation. Two different routes, includin…
View article: Perturbation analysis of baroclinic torque in low-Mach-number flows
Perturbation analysis of baroclinic torque in low-Mach-number flows Open
In this paper, we propse a series expansion of the baroclinic torque in low-Mach-number flows, so that the accuracy and universality of any buoyancy term could be examined analytically, and new types of buoyancy terms could be constructed …
View article: Late-time description of immiscible Rayleigh-Taylor instability: A lattice Boltzmann study
Late-time description of immiscible Rayleigh-Taylor instability: A lattice Boltzmann study Open
The late-time growth of single-mode immiscible Rayleigh-Taylor instability is investigated over a comprehensive range of the Reynolds numbers ($1\leq Re \leq 10000$) and Atwood numbers $(0.05 \leq A \leq 0.7)$ using an improved lattice Bol…
View article: On skin friction in wall-bounded turbulence
On skin friction in wall-bounded turbulence Open
In this paper, we derive mathematical formulas for the skin friction coefficient in wall-bounded turbulence based on the Reynolds averaged streamwise momentum equation and the total stress. Specially, with the theoretical or empirical rela…
View article: A universal kinetic equation solver for radiation belts
A universal kinetic equation solver for radiation belts Open
The zip file contains all scripts and simulation data used for producing Figure 2, Figure 3, Figure 4 and Table 2 of the manuscript "A universal kinetic equation solver for radiation belts".
View article: Bifurcation and multiple states in plane Couette flow with spanwise rotation
Bifurcation and multiple states in plane Couette flow with spanwise rotation Open
We present a derivation that begins with the Navier--Stokes equation and ends with a prediction of multiple statistically stable states identical to those observed in a spanwise rotating plane Couette flow. This derivation is able to expla…
View article: Obtaining the mean fields with known Reynolds stresses at steady state
Obtaining the mean fields with known Reynolds stresses at steady state Open
With the rising of modern data science, data--driven turbulence modeling with the aid of machine learning algorithms is becoming a new promising field. Many approaches are able to achieve better Reynolds stress prediction, with much lower …
View article: Effects of aquifer on heat exchange process in geothermal applications
Effects of aquifer on heat exchange process in geothermal applications Open
Geothermal energy has been widely used in the field of the building heating through the ground heat exchanger (GHE). The groundwater flow in the aquifer is one of the significant factors affecting the heat exchange process between the GHE …
View article: Assessment of the Irrigation Water Requirement and Water Supply Risk in the Tarim River Basin, Northwest China
Assessment of the Irrigation Water Requirement and Water Supply Risk in the Tarim River Basin, Northwest China Open
Studying the relationship between agricultural irrigation water requirements (IWR) and water supply is significant for optimizing the sustainable management of water resources in Tarim River Basin (TRB). However, the related studies have n…
View article: Numerical investigation of heat transfer characteristics in a shell-and-tube latent heat thermal energy storage system
Numerical investigation of heat transfer characteristics in a shell-and-tube latent heat thermal energy storage system Open
This paper presents the numerical investigation for a shell-and-tube latent heat thermal energy storage system (LHTES) employing numerical modeling and simulation with the FLUENT software. The LHTES consist of coilers where the heat transf…
View article: Spreading Dynamics of a CPFB Group Booking Preferential Information Model on Scale-Free Networks
Spreading Dynamics of a CPFB Group Booking Preferential Information Model on Scale-Free Networks Open
With the development of the Internet, online shopping has become a popular way of life in contemporary society. In recent years, online group booking has become an important strategy for e-commerce to promote commodities. In order to study…
View article: Transonic flow reconstruction by an adaptive proper orthogonal decomposition hybrid model
Transonic flow reconstruction by an adaptive proper orthogonal decomposition hybrid model Open
A proper orthogonal decomposition (POD) based hybrid surrogate model and the applications to transonic flow reconstructions are presented in the paper. In the implementations, the radial basis function (RBF) model response instead of the l…