CFD Estimation of a Resistance Coefficient for an Egg-Shaped Geometric Dome

Abstract

In aquaculture, new production technologies are under development and testing. One promising type of technology is the closed floating cage. Egget® is one of these newly developed technologies, which is egg-shaped and vertically floating. One of the challenges is to determine hydrodynamic loads. Therefore, this study focuses on estimating the resistance and the resistance coefficient for steady flow with various velocities and Reynolds numbers on a scaled model. It includes simulations using Computational Fluid Dynamics (CFD) for two depths and experiments in the MarinLab at Western Norway University of Applied Sciences (HVL). As the cage is partially submerged, the simulations are performed using the Volume of Fluid (VOF) technique for modeling free surface flow. The comparison of experimental and simulation results show good agreement.

Experimental Results of Helical Metal Expansion Joints Fabrication

“…Production and use of compensators are of significant importance for the reliability of pressure systems, which are widely utilized in industries as well as in many commonly used devices and machinery. This influences the quality [11][12][13] and safety of the functioning of the equipment and machinery that utilize them [14][15][16]. Material and thermomechanical equations allow for the solution of a straightforward issue: calculating deformations based on a given energy stream.…”

Geometrical Accuracy of Flexspline Prototypes Made by FDM/MEM Methods

“…Rapid prototyping has a wide range of applications and often involves the application of special coatings [20,21], including DLC [22][23][24] or electrospark deposition [25,26], modification of the morphology of the surface layer [27], or welding joints [28]. The presented article introduces a prototype of a flexible cup for a harmonic drive, which due to its significant possible gear ratios and high precision, can find applications in hydraulic control [29][30][31] and the military sector [32][33][34]. Due to the multidimensional dependencies, the implementation of formal statistical techniques [35][36][37], including expert systems support [38] and nonparametric approaches [39][40][41], is necessary.…”

Numerical Analysis of a Pneumatic Cushion Operation Safety, including the Airflow Conditions

“…Reliability and safety of pneumatic devices are of paramount importance as potential failures can pose a threat to the health and lives of workers, especially in high-pressure conditions [14][15][16]. Therefore, it is necessary to develop scenarios for potential failures [17][18][19], prevent them, and mitigate their consequences when they occur.…”