Detour flow field calculation method for square pier scouring problem
A calculation method and technology for bridge piers, which are applied in calculation, computer-aided design, design optimization/simulation, etc., can solve problems such as insufficient ability to capture microscopic flow details and poor calculation accuracy, and avoid grid-induced separation and ensure accuracy. , the effect of high calculation accuracy
Active Publication Date: 2021-01-05
CHINA THREE GORGES UNIV
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Problems solved by technology
As far as the numerical model is concerned, most of the actual engineering application cases are based on the calculation framework of the Reynolds time-averaged equation RANS. This method has poor calculation accuracy and relatively insufficient ability to capture microscopic flow details.
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Embodiment Construction
[0043]Embodiment The method of the present invention is tested and verified by using the experimental model of the river-crossing bridge and its pier reduced in proportion.
[0044] Such as figure 1 As shown, the calculation method of the flow field around the square pier scour problem includes the following steps:
[0045] Step 1: Construct the physical model of the square pier and its scouring water flow, that is, the flow around model;
[0046] Such as figure 2 As shown, the flow model around the square pier includes the inlet Inlet, the outlet Outlet, the wall Solidboundary and the square pier located in the computational domain. The side length of the square pier is D=40mm, the total length of the calculation domain is 25D, and the width is 14D. The distance from the left side of the square pier to the entrance is 5D, and at the center of the vertical direction, the center point of the square pier is used as the coordinate origin to establish XOY coordinates axis. Th...
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The invention discloses a flow-around flow field calculation method for a square pier scouring problem, and the method comprises the steps: building a physical model, i.e., a flow-around model, of a square pier and scouring water flow thereof; performing grid division on the physical model in the step 1, and dividing boundary layer grids in the area near the surface of the pier; importing the gridfile obtained in the step 2 into fluid finite element software, and establishing a numerical model of the square pier; setting a control equation solving format and numerical calculation precision ofthe square pier numerical model; calculating by utilizing the numerical model to obtain a streaming flow field of the square pier, and extracting a calculation result by utilizing post-processing software. According to the streaming flow field calculation method, high-precision numerical calculation is carried out on the streaming flow field with the actual engineering bridge scouring problem, detailed characteristic parameters and an unsteady flow structure of the flow field are obtained, and a theoretical support is provided for revealing a local scouring mechanism of a bridge.
Description
technical field [0001] The invention belongs to the field of bridge monitoring, and in particular relates to a calculation method for a flow field around a square bridge pier scour problem. Background technique [0002] In recent years, with the rapid development of the transportation industry, the number of bridges has continued to increase, and square piers have been widely used in the construction of viaducts along rivers. However, natural disasters caused by severe erosion at bridge piers and abutments have always occurred frequently, which has brought a very huge impact on the national economy. Under the condition of complex incoming flow, the flow around square piers includes complex flow phenomena such as backflow, impact, separation, reattachment and vortex shedding. In particular, the water blocking effect of the square pier changes the water flow structure, resulting in the horseshoe vortex system in front of the pier, the undercurrent and the wake vortex system, ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): G06F30/23G06F30/28G06F30/13G06F111/10G06F119/14G06F113/08
CPCG06F30/23G06F30/28G06F30/13G06F2111/10G06F2119/14G06F2113/08Y02T90/00
Inventor 洪锋张帆胡涛肖仁政
Owner CHINA THREE GORGES UNIV