#Asme ptc 19.3 software license#

This study provides a guideline for the design of bridges with asymmetrical main girders to suppress the VIV.Requirements for the Minimum Tip Thickness of the Stem While, the location of the vortex generation and direction of the vortex shedding at the wake are strongly influenced by the wind directions, resulting in the variation of the vortex-induced vibration properties of the bridge deck with the wind direction. The vortex-induced vibration mechanism of the bridge deck under different wind directions can be attributed to the same vortex shedding mode (the Kelvin–Helmholtz vortex and the Kármán vortex street).

The vortex-induced vibration of the bridge deck can be effectively mitigated when the damping ratio increases from 0.5% to 1.5%.

Both vehicles and wind barriers have amplification effects on the vortex-induced vibrations of the bridge deck when the wind direction is 180°. The vertical maximum vortex-induced vibration amplitude of the bridge deck was found to occur at the wind attack angle of −5° and wind direction of 180°, while the torsional maximum was found at the wind attack angle of −5° and wind direction of 0°. The test and simulation results show that the properties of the vortex-induced vibrations vary with the wind direction as a result of the asymmetry of the main girder. damping ratios, wind barriers, and vehicles on the vortex-induced vibration behaviors of the bridge deck is examined. Tests are performed for the bridge deck under five wind attack angles (0°, ☒.5°, and ±5°) and two wind directions (0° and 180°) during the completion and construction stages. The vortex-induced vibration behavior and mechanism of an asymmetrical composite beam cable-stayed bridge is investigated by means of aerodynamic sectional tests and computational fluid dynamics methods. The maximum contribution of the structures to the Reynolds shear stress was observed at approximately 6δ in length, whereas that of the TBL was at 1δ–2δ, indicating a higher contribution of the VLSMs to the Reynolds shear stress in the pipe flow than in the TBL flow. The average streamwise length scale of the pipe flow was approximately 1.5–3.0 times larger than that of the TBL through the log and wake regions. Such differences between the TBL and pipe flows arose due to the entrainment of large plumes of the intermittent potential flow in the TBL, creating break-down of the streamwise coherence of the structures above the log layer with the strong swirling strength and Reynolds shear stress. population trends of the momentum regions showed that the streamwise length of the structures in the pipe flow grew continuously beyond the log layer (y/δ 3δ), and the maximum length of the VLSMs increased up to ∼30δ.

Inspection of instantaneous fields, streamwise two-point correlations, and. The Reynolds number was set to ReD = 35 000, and the computational domain was 30 pipe radii in length. For more information on the patents, please see This paper will discuss the effectiveness of the helical strakes on a thermowell by the utilization of Computational Fluid Dynamics (CFD) and a coupled CFD/FEA (Finite Element Analysis) software.Ī direct numerical simulation of a fully developed turbulent pipe flow was performed to investigate the similarities and differences of very-large-scale motions (VLSMs) to those of turbulent boundary layer (TBL) flows.

#Asme ptc 19.3 software license#

This technology, as applied to thermowells, was patented by EnDet Ltd and currently licensed to Orbital Gas Limited with a sub license to Daily Thermetrics. Helical strakes have been added to cylindrical bodies in other industries to prevent the VIV and have been recently used on thermowells. Thermowells must be designed to prevent the frequency caused by the VIV to approach their natural frequency, since this can cause catastrophic damage. The natural frequency of the thermowell is also calculated, and then, the two are compared.

One of the calculations is to determine the frequency of the wake due to the vortex-induced vibrations (VIV) caused by the flow across the thermowell. This is done by subjecting the designed thermowell to multiple calculations. This standard helps manufacturers and users calculate the suitability of the thermowell in their given process conditions. The American Society of Mechanical Engineers (ASME) wrote a standard that establishes the practical design considerations for thermowell installations in power and process piping, known as ASME PTC 19.3 TW-2016. Thermowells are used to protect the instrumentation inside pipes or vessels and are commonly used in the petrochemical industry.