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Method for evaluating surface drag reduction effect of different morphologies of microstructures based on numerical simulation

A numerical simulation and evaluation method technology, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of high cost of special-shaped structures, long experimental period is difficult to evaluate, and it is difficult to obtain the influence law of drag reduction effect, etc., to achieve The effect of short cycle and low cost

Active Publication Date: 2019-08-06
JIANGSU UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a method for evaluating the drag reduction effect of surfaces with different microstructures based on numerical simulation, which can effectively solve the problems of high cost of preparing special-shaped structures, long experimental period, difficult evaluation of drag reduction effect, and difficulty in obtaining Disadvantages of the influence of surface topography on drag reduction effect

Method used

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  • Method for evaluating surface drag reduction effect of different morphologies of microstructures based on numerical simulation
  • Method for evaluating surface drag reduction effect of different morphologies of microstructures based on numerical simulation
  • Method for evaluating surface drag reduction effect of different morphologies of microstructures based on numerical simulation

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Embodiment 1

[0034] like figure 1 As shown, (1) Build the model: Use Icem software to build a fluid model on the surface of the two-dimensional semicircular pit-shaped microstructure. First establish the origin, and then establish nodes with the origin as the reference point. The overall size is 4mm in length and 1mm in width. , the size of the microstructure is groove width a=200 μm, protrusion width b=200 / 100 / 40 / 20 / 4 μm, groove depth h=100 μm.

[0035] (2) Mesh division: define the left end of the model as the entrance, the right end as the exit, and the others as the wall. Build and divide the model into blocks to ensure that each microstructure is regarded as an independent block. After dividing the blocks, the divided blocks and Correlate each part. After the correlation is completed, set the grid type at the microstructure to O-grid, and perform an encryption process on the grid near the wall. Set the grid density Spacing to 0.0001, and the growth rate Ratio to 1.2 to ensure that the...

Embodiment 2

[0043] (1) Modeling: Use Icem software to construct a fluid model of a two-dimensional triangular microstructure surface. First establish the origin, and then establish nodes with the origin as a reference point. The overall size is 4 mm in length, 1 mm in width, and the microstructure size is Groove width a=200 μm, protrusion width b=200 / 100 / 40 / 20 / 4 μm, groove depth h=100 μm.

[0044] (2) Mesh division: Define the left end of the model as the entrance, the right end as the exit, and the others as the wall. Build and divide the model into blocks to ensure that each microstructure is an independent block. After dividing the blocks, divide the microstructure Adjust the nodes of the blocks, adjust the cross-shaped nodes into Y-shaped nodes, and associate the blocks after adjusting the nodes with each part. After the association is completed, set the Y-shaped grid at the microstructure, and set the quadrilateral grid at other parts. Encrypt the grid near the wall, set the grid den...

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Abstract

The invention discloses a method for evaluating the surface drag reduction effect of different morphologies of microstructures based on numerical simulation, which specifically comprises the followingsteps of: (1) establishing a model: establishing fluid models on different microstructure surfaces, and adjusting the fluid models according to microstructure parameters; (2) grid division: opening afluid model in an Icem module of Ansys, and carrying out grid division to obtain a mesh file; (3) solution operation: opening a mesh file, selecting a calculation model and applying a boundary condition, and performing solution to obtain a case file; (4) data exporting: exporting the data in the case file, and outputting the speed and pressure at the key point to reflect the data of the drag reduction effect; (5) data processing: processing the data in the previous step, comparing the pressure difference values of the smooth surface and the microstructure surface, calculating to obtain a dragreduction rate, and drawing a data graph; and (6) analysis and evaluation: analyzing the data graph, searching for drag reduction rules of different microstructure surfaces, and evaluating the drag reduction effect.

Description

technical field [0001] The invention relates to an evaluation method of surface drag reduction technology, in particular to a numerical simulation-based evaluation method of surface drag reduction effects of different microstructures. Background technique [0002] In nature, lotus leaves rolling water droplets, cicada wings condensing dew, and sharks flying back and forth, these phenomena show us a strange surface infiltration phenomenon. This unique wettability surface has a contact angle with water of greater than 150° and a rolling angle of less than 10°, which is called a superhydrophobic surface. A large number of studies have shown that super-hydrophobic surfaces have good drag reduction effects and can be used in industries such as marine transportation, medical equipment, and pipeline transportation. For example, the use of super-hydrophobic technology on ships and submarines can effectively increase the speed of the aircraft and reduce the use of energy; the prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20Y02T90/00
Inventor 叶霞顾江徐伟范振敏张鹏杨晓红徐胜陆磊冯欢
Owner JIANGSU UNIV OF TECH
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