Node Flow Optimization for Transient Hydraulic Simulation Accuracy
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Solution Overview
Problem
Conventional methods for simplifying water supply in-series pipeline models lack a scientific and effective approach to retain transient hydraulic characteristics, leading to inaccuracies in transient flow simulation and potential safety issues in pipeline network management.
Innovation Solution
A node flow optimization distribution method that identifies same-diameter in-series pipeline systems, establishes optimization objective functions to minimize simplification errors, and determines optimal flow distribution coefficients to maintain transient hydraulic characteristics, ensuring accurate transient hydraulic simulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional empirical or semi-empirical methods are used for flow distribution of intermediate nodes in simplified pipeline models, then the model complexity is reduced and steady-state calculation results are maintained, but the transient hydraulic simulation accuracy deteriorates significantly
Solution Approach 1:
The patent changes the parameters used for flow distribution from empirical coefficients to physically-based parameters including transient pressure wave propagation characteristics, water hammer effects, and dynamic flow distribution coefficients. This allows the simplified model to capture transient hydraulic behavior while maintaining reduced complexity.
Solution Approach 2:
The patent performs preliminary calculation of transient pressure wave propagation paths and identifies critical intermediate nodes before simplification. This preliminary analysis enables the flow distribution method to be optimized in advance for transient conditions, ensuring accuracy is preserved during the simplification process.
2Reliability
If detailed and complex system information from GIS is used in hydraulic models, then the model comprehensiveness is improved, but the model scalability and ease of management deteriorate
Solution Approach 1:
The patent segments the pipeline network into distinct functional zones and identifies in-series pipeline sections that can be independently simplified. This segmentation allows selective application of simplification rules to different parts of the network, maintaining comprehensiveness where needed while improving scalability in other areas.
Solution Approach 2:
The patent applies simplification selectively to specific pipeline sections rather than uniformly across the entire network. Critical sections with complex transient behavior are simplified with higher fidelity, while less critical sections receive greater simplification, achieving a balance between comprehensiveness and scalability.
Data Source
AI summary
The present invention discloses a node flow optimization distribution method for improving the accuracy of transient hydraulic simulation of a water supply in-series pipeline. The present invention optimizes the flow distribution coefficients of intermediate nodes to minimize the impact thereof on the calculation and analysis of transient flow. Further, the simplified error generated by the node flow distribution can be quantified and evaluated by the control threshold of the simplified errors to achieve effective control of the simplified process. In addition, the simplified operation of the method of the present invention is carried out sequentially from the intermediate node with the smallest simplified error, which effectively overcomes the potential defect of the conventional node flow distribution that leads to a significant reduction in the accuracy of the model, and can ensure the reliability and accuracy of the simplified operation of the same-diameter in-series pipeline.