Shuxun Li^1,2, Xinhao Liu^1,2,*, Yu Zhang^1,2, Yu Zhao^1,2

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.10, pp. 2495-2526, 2025, DOI:10.32604/fdmp.2025.068674 - 30 October 2025

Abstract Hydraulic control valves, positioned at the terminus of pipe networks, are critical for regulating flow and pressure, thereby ensuring the operational safety and efficiency of pipeline systems. However, conventional valve designs often struggle to maintain effective regulation across a wide range of system pressures. To address this limitation, this study introduces a novel Pilot hydraulic valves specifically engineered for enhanced dynamic performance and precise regulation under variable pressure conditions. Building upon prior experimental findings, the proposed design integrates a high-fidelity simulation framework and a surrogate model-based optimization strategy. The study begins by formulating a comprehensive… More >

Leonid Plotnikov^*

Frontiers in Heat and Mass Transfer, Vol.23, No.5, pp. 1443-1454, 2025, DOI:10.32604/fhmt.2025.068060 - 31 October 2025

Abstract Industry and energy continue to require piston engines (PICE) at a high level worldwide. Therefore, science and technology must urgently work on improving the PICE working cycle. Improving the quality of the intake process of the working fluid into the cylinder is one of the most effective ways to improve the operational performance of PICE. The purpose of the study was to assess the impact of various cylinder head (CylH) designs on the gas-dynamic and heat-exchange qualities of air flows within an engine model’s intake system. Three different CylH designs were studied: the basic configuration… More >

Edo Bedzra^1,2,*, Herra Javed^3,4, James E. O’Brien^1,2, Taufiek Konrad Rajab^3,4

Congenital Heart Disease, Vol.20, No.4, pp. 441-446, 2025, DOI:10.32604/chd.2025.071035 - 18 September 2025

Abstract A bicuspid aortic valve, from autologous tissue, with growth potential can be constructed using the simple, and reproducible telescoping arterial trunk technique. More >

Emrah Şişli^1,*, Pelin Köşger²

Congenital Heart Disease, Vol.20, No.4, pp. 531-537, 2025, DOI:10.32604/chd.2025.067271 - 18 September 2025

Abstract Residual atrioventricular valve regurgitation after correction of complete atrioventricular septal defect (cAVSD) is still not ideal. As a modification of the double-patch method, our technique comprises a suture-bite-wide strip of a third patch that is incorporated to the upper margin of the left side of the ventricular septal defect (VSD) patch. This third patch counteracts not only the valvular tissue loss caused by the suture bites but also the rightward displacement of the VSD patch in a bulged fashion that occurs with increased left ventricular pressure after weaning from cardiopulmonary bypass. This unfavorable outcome was More >

Shuxun Li^1,2, Yuhao Tian^1,2,*, Guolong Deng^1,2, Wei Li^1,2, Yinggang Hu^1,2, Xiaoya Wen^1,2

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.8, pp. 1809-1837, 2025, DOI:10.32604/fdmp.2025.065877 - 12 September 2025

Abstract The conventional Shear Stress Transport (SST) k–ω turbulence model often exhibits substantial inaccuracies when applied to the prediction of flow behavior in complex regions within axial flow control valves. To enhance its predictive fidelity for internal flow fields, this study introduces a novel calibration framework that integrates an artificial neural network (ANN) surrogate model with a particle swarm optimization (PSO) algorithm. In particular, an optimal Latin hypercube sampling strategy was employed to generate representative sample points across the empirical parameter space. For each sample, numerical simulations using ANSYS Fluent were conducted to evaluate the flow characteristics,… More >

Wilhelm Mistiaen^*

Congenital Heart Disease, Vol.20, No.3, pp. 305-323, 2025, DOI:10.32604/chd.2025.064675 - 11 July 2025

Abstract The presence of a bicuspid aortic valve (BAV) is the most common congenital heart anomaly, which can remain asymptomatic for decades, if it is not a part of a syndrome, such as Turner syndrome or genetic connective tissue disorders. There are several classifications for BAV, each with its advantages and drawbacks. The condition can lead to valvular malfunction such as regurgitation and stenosis, but is often associated with dilatation of the aortic root, the ascending aorta, the aortic arch, or a combination. Altered flow patterns due to the valve dysfunction as well as the breakdown… More >

Geemitha Ratnayake^*, Yaqoub Jafar, Bruno Leslie, Luis Henrique Braga^*

Canadian Journal of Urology, Vol.32, No.3, pp. 209-212, 2025, DOI:10.32604/cju.2025.064122 - 27 June 2025

Abstract Background: Bladder augmentation is often necessary to address poorly compliant and low-capacity bladders which can result from Posterior Urethral Valve. Traditional techniques are limited by complications from using bowel tissue, thus in the setting of a megaureter, ureterocystoplasty is favorable. Methods: We present a case of Teapot ureterocystoplasty, which improves vascular protection of the ureter by leaving the distal 3 cm of the ureter tubularized. Cystograms demonstrated bladder capacity improvement from 50 mL to 180 mL post-operatively. Additionally, creatinine stabilized after a peak of 250 µmol/L. Result and Conclusion: This patient is doing well at 4.5-year More >

Shuxun Li^1,2, Jianwei Wang^1,2,*, Tingjin Ma¹, Guolong Deng^1,2, Wei Li^1,2

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.4, pp. 959-988, 2025, DOI:10.32604/fdmp.2025.059570 - 06 May 2025

Abstract In photothermal power (solar energy) generation systems, purging residual molten salt from pipelines using high-pressure gas poses a significant challenge, particularly in clearing the bottom of regulating valves. Ineffective purging can lead to crystallization of the molten salt, resulting in blockages. To address this issue, understanding the gas-liquid two-phase flow dynamics during high-pressure gas purging is crucial. This study utilizes the Volume of Fluid (VOF) model and adaptive dynamic grids to simulate the gas-liquid two-phase flow during the purging process in a DN50 PN50 conventional molten salt regulating valve. Initially, the reliability of the… More >

Baker M. Ayyash¹, Yen Chuan Chen², Ahmad Sallehuddin², Ziyad M. Hijazi^1,*

Congenital Heart Disease, Vol.20, No.2, pp. 143-179, 2025, DOI:10.32604/chd.2025.064599 - 30 April 2025

Abstract Pediatric heart valve replacement (PHVR) remains a challenging procedure due to the unique anatomical and physiological characteristics of children, including growth and development, as well as the long-term need for durable valve function. This review provides an overview of both surgical and transcatheter options for aortic, mitral, pulmonary, and tricuspid valve replacements in pediatric patients, highlighting the indications, outcomes, and advancements in technology and technique. Surgical valve replacement traditionally involves the implantation of biological or mechanical prosthetic valves, with biological valves being preferred in children to reduce the need for lifelong anticoagulation therapy. However, the… More >

Hayatu Uma^1,*, Abdulaziz Aminu¹, Raghu Cherukupalli², Femi Akindotun Akintomide¹, Abdul Habu³, Aisha Aminu Lawal¹, Adamu Mohammad¹

Congenital Heart Disease, Vol.19, No.6, pp. 635-645, 2024, DOI:10.32604/chd.2025.056641 - 27 January 2025

Abstract Laubry-Pezzi syndrome (L-PS) is a rare congenital heart disease characterized by a ventricular septal defect (VSD) and aortic valve prolapse. These cardiac lesions predispose individuals to infective endocarditis (IE), a life-threatening complication, especially in resource-constrained settings. A 17-year-old male presented with a three-week history of fever and headache, and a one-week history of abdominal pain, vomiting, and diarrhea. On presentation, he appeared toxic, was febrile, tachypneic, tachycardic, and blood pressure of 120/30 mmHg, and heart sounds were S1, S2. Abdominal examination revealed generalized tenderness. A provisional diagnosis of typhoid sepsis with intestinal perforation was considered.… More >