Virtual Wave Structure Interaction (WSI) Simulation Environment

该项目是STFC-RAL与两所大学之间的密切合作，这两所大学在研究波浪与固定和浮动结构的相互作用方面具有丰富的经验，它们共同努力，将联合收割机结合起来，并应用其专业知识对问题进行建模。其目的是开发在大规模多处理器集群和多核GPU上实现的集成并行代码，提供对刚性和弹性结构的猛烈水动力冲击载荷的详细物理的快速详细数值波浪水槽解决方案。该项目与一个精心整合的大规模数值模拟和物理实验方案有关，也是该方案的一部分。开放源代码的数值代码将被开发，以模拟实验室实验中进行的新的国家波和电流设施在UoP.It是众所周知的，气候变化将导致海平面上升和风暴活动增加（更严重的个别风暴或更多的风暴整体，或两者兼而有之）在英国和西北欧的近海海洋环境。这对于现有海上结构上的人员的安全以及现有和新类型的LNG运输船的安全操作具有关键影响，现有和新类型的LNG运输船的结构经受由于所运输的液体在恶劣海洋中的剧烈晃动而引起的大的且目前未量化的瞬时载荷。英国沃茨中存在的石油和天然气海上结构已经使用了40年，这些老化的结构需要重新评估，以确保它们能够承受由于气候变化而日益不利的海洋中增加的载荷，并确认它们的寿命可以延长到未来25年。升级现有结构物和确保新结构物和船舶的生存能力和安全运行的成本将主要取决于水动力冲击载荷预测的可靠性。这些载荷会对海堤、为晃动液体提供密封的储罐（例如液化天然气运输船）造成严重损坏，并对浮式生产储油卸油轮（FPSO）和其他海上浮式结构（例如波浪能转换器）造成损坏。虽然对大量流体的流体动力学了解相对较好，但水面的剧烈运动和破碎仍然是工程设计中需要足够准确模拟的主要挑战。虽然自由表面高度和平均载荷通常通过分析技术相对较好地预测，但在这种极端条件下观察到的瞬时峰值压力不能可靠地预测，并且即使在仔细控制的实验室实验中也常常不可重复。关于流体动力冲击载荷的详细物理特性，甚至对于固定结构和可能发生的极高压力脉冲，仍然存在一些基本的未决问题。特别是，在理解以下因素的影响方面存在不确定性：（截留的气泡和夹带的气泡），其中海水的声学特性变化导致实验中测量的波浪冲击压力的变化;结构的柔性导致水弹性响应;陡度和入射波的三维度。该建议旨在提高目前的能力，直接攻击这个根本上困难和安全的，通过加速最先进的数值模拟，旨在为固定和浮动的离岸，海洋和沿海结构物的设计师提供目前无法实现的详细解决方案，解决了这一关键问题。

The project is a close collaboration between STFC-RAL and 2 universities with significant experience in research into wave interactions with fixed and floating structures working together to combine and apply their expertise to model the problem. The aim is to develop integrated parallel code implemented on a massively multi-processor cluster and mutli-core GPUs providing fast detailed numerical wave tank solutions of the detailed physics of violent hydrodynamic impact loading on rigid and elastic structures. The project is linked to and part of a carefully integrated programme of numerical modelling and physical experiments at large scale. Open source numerical code will be developed to simulate laboratory experiments to be carried out in the new national wave and current facility at the UoP.It is well known that climate change will lead to sea level rise and increased storm activity (either more severe individual storms or more storms overall, or both) in the offshore marine environment around the UK and north-western Europe. This has critical implications for the safety of personnel on existing offshore structures and for the safe operation of existing and new classes of LNG carrier vessels whose structures are subject to large and at present unquantified instantaneous loadings due to violent sloshing of transported liquids in severe seas. There exist oil and gas offshore structures in UK waters are already up to 40 years old and these aging structures need to be re-assessed to ensure that they can withstand increased loadings in increasingly adverse seas as a result of climate change, and to confirm that their life can be extended into the next 25 years. The cost of upgrading existing structures and of ensuring the survivability and safe operation of new structures and vessels will depend critically on the reliability of hydrodynamic impact load predictions. These loadings cause severe damage to sea walls, tanks providing containment to sloshing liquids (such as in LNG carriers) and damage to FPSOs and other offshore marine floating structures such as wave energy converters.Whilst the hydrodynamics in the bulk of a fluid is relatively well understood, the violent motion and break-up of the water surface remains a major challenge to simulate with sufficient accuracy for engineering design. Although free surface elevations and average loadings are often predicted relatively well by analysis techniques, observed instantaneous peak pressures are not reliably predicted in such extreme conditions and are often not repeatable even in carefully controlled laboratory experiments. There remain a number of fundamental open questions as to the detailed physics of hydrodynamic impact loading, even for fixed structures and the extremely high-pressure impulse that may occur. In particular, uncertainty exists in the understanding of the influence of: the presence of air in the water (both entrapped pockets and entrained bubbles) where the acoustic properties of seawater change leading to variability of wave impact pressures measured in experiments; flexibility of the structure leading to hydroelastic response; steepness and three dimensionality of the incident wave.This proposal seeks to improve the current capability to directly attack this fundamentally difficult and safety-critical problem by accelerating state of the art numerical simulations with the aim of providing detailed solutions not currently possible to designers of offshore, marine and coastal structures, both fixed and floating.