The purpose of this study is to numerically simulate the Lamb wave propagation through a clamp-on ultrasonic gas flowmeter (UGF) in contact mode, using a new semi three-dimensional approach. Moreover, experimental and analytical modeling results for transit time difference method have been used to confirm the simulation results at different gas flow velocities from 0.3 to 2.4 m/s.,The new semi three-dimensional approach involves the simulation of the flow field of the gas in a three-dimensional model and subsequently the simulation of wave generation, propagation and reception in a two-dimensional (2D) model. Moreover, the analytical model assumes that the wave transitions occur in a 2D mode.,The new approach is a semi three-dimensional approach used in this work, has better accuracy than a complete 2D simulation while maintaining the computing time and costs approximately constant. It is faster and less expensive than a complete 3D simulation and more accurate than a complete 2D simulation. It was concluded that the new approach could be extended to simulate all types of ultrasonic gas and non-gas flowmeters, even under harsh conditions.,In this work, a new approach for the numerical simulation of all types of ultrasonic flowmeters is introduced. It was used for simulation of a Lamb wave ultrasonic flow meter in contact mode.

中文翻译：

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兰姆波钳式超声波气体流量计半三维仿真新方法

本研究的目的是使用一种新的半三维方法，数值模拟兰姆波在接触模式下通过夹式超声波气体流量计 (UGF) 的传播。此外，时差法的实验和分析建模结果已被用于确认在 0.3 到 2.4 m/s 的不同气流速度下的模拟结果。新的半三维方法涉及对流场的模拟。三维模型中的气体，随后在二维 (2D) 模型中模拟波的产生、传播和接收。此外，分析模型假设波浪跃迁发生在 2D 模式中。新方法是这项工作中使用的半三维方法，比完整的 2D 模拟具有更好的准确性，同时保持计算时间和成本大致恒定。它比完整的 3D 模拟更快、更便宜，并且比完整的 2D 模拟更准确。结论是新方法可以扩展到模拟所有类型的超声波气体和非气体流量计，即使在恶劣的条件下。,在这项工作中，介绍了一种新的方法来模拟所有类型的超声波流量计。它用于模拟接触模式下的兰姆波超声波流量计。即使在恶劣的条件下。,在这项工作中，介绍了一种新的方法来对所有类型的超声波流量计进行数值模拟。它用于模拟接触模式下的兰姆波超声波流量计。即使在恶劣的条件下。,在这项工作中，介绍了一种新的方法来对所有类型的超声波流量计进行数值模拟。它用于模拟接触模式下的兰姆波超声波流量计。