Quantitative analysis of enhanced mixing and combustion by lobed mixer in a ramjet engine: Study using hyperbolic Lagrangian coherent structures

Understanding blood transport in cardiovascular flows is important for managing patients with cardiovascular disease. In this study, three-dimensional Lagrangian coherent structures have been extracted for the first time in both healthy patients and patients with aortic regurgitation. To achieve this, a computationally efficient approach based on Lagrangian descriptors was employed with four-dimensional (4D) magnetic resonance imaging velocity fields. In healthy subjects, Lagrangian coherent structures analysis revealed well-defined mitral jet structures during early filling, directing flow toward ejection during systole. For patients with aortic regurgitation, complex flow structures included interactions between the mitral and regurgitant jets, indicating altered blood transport mechanisms. This study highlights the ability of Lagrangian descriptors to extract coherent structures from patient-specific 4D flow MRI data in a computationally efficient way. It also underscores the importance of extracting three-dimensional Lagrangian coherent structures to gain a better understanding of the complex interaction between the mitral inflow and the regurgitant jet.

Three-dimensional Lagrangian coherent structures in patients with aortic regurgitation

Multi-dimension-precision chaotic encryption mechanism for Internet of Things

Lagrangian gradient regression for the detection of coherent structures from sparse trajectory data

Tungsten is considered to be the most promising material for plasma-facing components of fusion reactors in addition to other industrial and military uses. Activated tungsten dust produced by plasma-wall interaction and released under accidental conditions would be the emerging environmental pollutant with both chemical and radiation toxicity. For the first time, atmospheric dispersion and deposition characteristics were investigated for tungsten dust with various particle size spectrum similar as generated in fusion reactors. Euler-Lagrange approach was adopted to describe parcels motion and deposition behaviors. Proper numbers of parcels were determined for the atmospheric dispersion and various parcel diameters scale. Near-surface concentration distribution and dry deposition velocity were predicted for tungsten dust with both single size dust and realistic particle size spectrum dust. Influences of chemical forms and release factors on atmospheric dispersion and deposition of tungsten dust were preliminary identified at last. It is indicated that 150 million parcels are needed for 10 μm dust under 5 km scale. Dry deposition velocity of tungsten dust is up to 11.3 cm s−1 and increase along with particle diameter because of its high density and gravitational deposition effect. The critical diameter judging whether gravitational deposition could appear for tungsten dust is 1 µm. Deposited particle size spectrum would be completely different along the downwind distance which would result in differences in subsequent behaviors in other environmental compartments. 

Predictive atmospheric dispersion and deposition characteristics of activated tungsten dust

An efficient approach for computing the finite time Lyapunov exponent in complex three-dimensional flow based on the discrete phase model

Considering the angle of attack of the missile using solid rocket ramjet changes in large range, this paper adopts the method of numerical simulation, study how the angle of attack influences the inlet flow field characteristics and performance parameters, and analyzes the mechanism of its formation based on the basic theory of aerodynamic, providing the necessary reference for the inlet design and performance estimation. At both positive and negative angles of attack, the total pressure recovery at the outlet decreases. With the increase of the angle of attack, the outlet pressure increases, while the outlet Mach number decreases, and the captured mass flow rate increases. When the angle of attack increases to a certain extent, the captured flow rate in the throat will be choked, and the inlet works in unstarting mode.

Numerical Simulations of Two-Dimensional Hypersonic Inlet At Finite Flight Angles

Currently, the strength of the solid rocket motor shell is always checked without the consideration of the connecting blot and the nozzle, making the simulation cannot reproduce actual operating process to the full extent. In order to address the problem, this study adopted integrated joint simulation and checked the strength of a solid rocket motor shell under the operating condition with the maximum deviation, during which the nozzle and the connecting bolt were taken into account. Main conclusions are described below: The thermal insulation thickness of the nozzle satisfied the design requirement, and the temperature rise of the metal part at the outermost layer was only 2 K, i.e., the loss of strength induced by overheating can be avoided. The safety coefficient of the combustor shell was 1.46, which suggest that it was a reasonable design and can satisfy the operating requirement. The connecting bolt, the rear joint and the metal part of the nozzle were all at low stress level, with high safety coefficients. Accordingly, the structural integrity can be maintained during the operation.

Strength Check for a Solid Rocket Motor Shell based on Integrated Joint Simulation

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Papers

An efficient approach for computing the finite time Lyapunov exponent in complex three-dimensional flow based on the discrete phase model

Quantitative analysis of enhanced mixing and combustion by lobed mixer in a ramjet engine: Study using hyperbolic Lagrangian coherent structures

Numerical Simulations of Two-Dimensional Hypersonic Inlet At Finite Flight Angles

Strength Check for a Solid Rocket Motor Shell based on Integrated Joint Simulation