Fang Jin^*, Dong Zhou, Liying Zhu

FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.2, pp. 285-302, 2022, DOI:10.32604/fdmp.2022.017593

Abstract The purpose is to study the microstructure and macroscopic fluid-dynamic behavior of soft soil after it has been subjected to a seepage consolidation procedure. First, the microscopic pore structure of soft clay is quantitatively studied by a scanning electron microscope technique. Second, the average contact area rate of soil particles is obtained employing statistical analysis applied to microscopic images of soft soil, and the macroscopic porosity of soft clay is determined through an indoor geotechnical test. Finally, mathematical relationships are introduced by fitting the results of the test. The results show that the unmodified empirical equation for the permeability coefficient… More >

Yueli Feng^1,2, Yuetian Liu^1,2,*, Xiaolong Mao^1,2, Jian Chen^1,2

FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.2, pp. 371-393, 2022, DOI:10.32604/fdmp.2022.017534

Abstract This study clarifies the seepage characteristics of complex fractured pressure-sensitive reservoirs, and addresses a common technological problem, that is the alteration of the permeability degree of the reservoir bed (known to be responsible for changes in the direction and velocity of fluid flows between wells). On the basis of a new pressure-sensitive equation that considers the fracture directional pressure-sensitive effect, an oil-gas-water three-phase seepage mathematical model is introduced, which can be applied to pressure-sensitive, full-tensor permeability, ultralow-permeability reservoirs with fracture-induced anisotropy. Accordingly, numerical simulations are conducted to explore the seepage laws for ultralow-permeability reservoirs. The results show that element patterns… More >

Jiawei Shi¹, Shuai Ge¹, Xiaozhen Sheng^2,*

FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.2, pp. 463-480, 2022, DOI:10.32604/fdmp.2022.017508

Abstract In order to understand the mechanism by which a pantograph can generate aerodynamic noise and grasp its far-field characteristics, a simplified double-strip pantograph is analyzed numerically. Firstly, the unsteady flow field around the pantograph is simulated in the frame of a large eddy simulation (LES) technique. Then the location of the main noise source is determined using surface fluctuating pressure data and the vortex structures in the pantograph flow field are analyzed by means of the Q-criterion. Based on this, the relationship between the wake vortex and the intensity of the aerodynamic sound source on the pantograph surface is discussed.… More >

Jian Song^*

FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.2, pp. 345-354, 2022, DOI:10.32604/fdmp.2022.017382

Abstract Computational Fluid Dynamics is used to assess the thermal (heat transfer) performances of an automobile engine considering different grille opening and closing degrees. For this purpose the entire vehicle is modelled and three fundamental aspects are examined, namely, the open area of the air intake grille, the position of the upper and lower grilles and their shape. The results show that the opening area and position of the grille have some influence also on the aerodynamic characteristics of the automobile. With an increase in the opening angle of the grille, the C_D (Drag Coefficient) value of the whole vehicle becomes… More >

Jianhui Yang¹, Kai Shen¹, Shoudong Pan², Shuren Wang^3,*, Zhengsheng Zou³

FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.2, pp. 243-255, 2022, DOI:10.32604/fdmp.2022.016677

Abstract The large deformation of soft rock tunnel is one of the key problems to be overcome in the tunnel construction stage. In the present study, the deformation mechanism of a representative tunnel and some related countermeasures are investigated using field tests and engineering geological analysis. Owing to the scarce performances of methods based on other criteria such as small pipe spacing, anchor bolt length and steel frame spacing, a new support scheme is implemented and optimized. Results show that shear failure and bedding sliding are produced under high horizontal stress conditions. The low strength of the surrounding rock results in… More >

Xiangxi Du^1,*, Muyun Liu², Yanhua Sun¹

FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.2, pp. 303-312, 2022, DOI:10.32604/fdmp.2022.016242

Abstract The computational fluid dynamics (CFD) technology is analyzed and calculated utilizing the turbulence model and multiphase flow model to explore the performance of internal circulating fluidized beds (ICFB) based on CFD. The three-dimensional simulation method can study the hydrodynamic properties of the ICFB, and the performance of the fluidized bed is optimized. The fluidization performance of the ICFB is improved through the experimental study of the cross-shaped baffle. Then, through the cross-shaped baffle and funnel-shaped baffle placement, the fluidized bed reaches a coupled optimization. The results show that CFD simulation technology can effectively improve the mass transfer efficiency and performance… More >

Wei Chen^1,2, Zhaofeng Guo^3,4,*, Hongda Feng^3,4, Sheng Hu^1,2, Ling Lu^1,2, Chuanmin Chen^3,4, Xiaowen Wu^1,2, Hao Cao^1,2

FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.2, pp. 481-496, 2022, DOI:10.32604/fdmp.2022.015746

Abstract This study investigates a dual-cavity resonant composite sound-absorbing structure based on a micro-perforated plate. Using the COMSOL impedance tube model, the effects of various structural parameters on sound absorption and sound insulation performances are analyzed. Results show that the aperture of the micro-perforated plate has the greatest influence on the sound absorption coefficient; the smaller the aperture, the greater is this coefficient. The thickness of the resonance plate has the most significant influence on the sound insulation and resonance frequency; the greater the thickness, the wider the frequency domain in which sound insulation is obtained. In addition, the effect of… More >

TAILIN WU^1,#; XIANG ZHOU^2,#; CANHUA YE¹; WENCAN LU¹; HAITAO LIN¹; YANZHE WEI¹; ZEKAI KE¹; ZHENGJI HUANG¹; JIANZHOU LUO¹; HUIREN TAO¹; CHUNGUANG DUAN^1,*

BIOCELL, Vol.46, No.4, pp. 1123-1123, 2022, DOI:10.32604/biocell.2022.020679

Abstract This article has no abstract. More >

FEI CHENG^1,#, YIQIAN DING^2,#, QING XU³, WEI ZHANG³, YULAN ZHEN⁴, JING LIU⁵, SHICHENG LI¹, CHANG TU¹, GUOHUA LAI¹, JUN LAN^1,*, JINGFU CHEN^1,*

BIOCELL, Vol.46, No.4, pp. 1053-1066, 2022, DOI:10.32604/biocell.2021.012901

Abstract Previous reports have suggested that Ang-(1-7) may have a protective effect in endothelial cells against high glucose (HG)-induced cell injury thanks to a modulatory mechanism in the NF-κB signaling pathway. In this study, we have examined whether NF-κB-IL-1β and Heme oxygenase-1 (HO-1) pathways contribute to the protection of Ang-(1-7) against hyperglycemia-induced inflammation and oxidative stress in human umbilical vein endothelial cells (HUVECs). Our results indicate that time-varying exposures of HUVECs, from 1 h to 24 h, to high glucose concentrations result in an increased expression of phosphorylated (p)-p65 and HO-1 in a time-dependent manner. As an inhibitor of NF-κB, pyrrolidinedithiocarbamic… More >

MICHELE DI COSOLA^1,§; STEFANIA CANTORE^2,§,*; MARIO GIOSUÈ BALZANELLI³; CIRO GARGIULO ISACCO^2,3; KIEU CAO DIEM NGUYEN^2,3; RAJIV SAINI²; ANNARITA MALCANGI⁴; MARGHERITA TUMEDEI⁵; MARIATERESA AMBROSINO¹; ANTONIO MANCINI²; SALVATORE SCACCO⁶; RICCARDO NOCINI⁷; LUIGI SANTACROCE²; ANDREA BALLINI^8,9,#,*; EDOARDO BRAUNER^10,#

BIOCELL, Vol.46, No.4, pp. 923-929, 2022, DOI:10.32604/biocell.2022.018409

Abstract The human teeth and oral cavity harbor various populations of mesenchymal stem cells (MSCs), so called dental-derived stem cells (D-dSCs) with self-renewing and multilineage differentiation capabilities. D-dSCs properties involves a strong paracrine component resulting from the high levels of bioactive molecules they secrete in response to the local microenvironment. Altogether, this viewpoint develops a general picture of current innovative strategies to employ D-dSCs combined with biomaterials and bioactive factors for regenerative medicine purposes, and offers information regarding the available scientific data and possible applications. More >