Automatic Recognition Method of the Reversed Flow Region in Digitalized Path-Line Pictures

• MURATA Shigeru

• YOSHIOKA Hitoshi

• KUSHIYAMA Tadashi

• KISE Hiroshi

抄録

A method of automatic recognition of the reversed flow region in a digitalized path-line picture has been proposed. Flow direction is locally determined by calculating the vorticity at an average position among four neighboring pathlines in four different ways. The input image needed in this method is only one path-line picture taken with standard camera equipment. In order to examine the accuracy, this method is applied to determine the flow directions in a separated flow around a circular cylinder, using the velocity distribution obtained numerically by the MAC method. It is found that only 2% error occurs in this case. As an application of the method to a flow visualization picture, a reversed flow region in a square cavity is recognized by the method, and the result is in good agreement with that of other experimental methods.

収録刊行物

• JSME international journal. Ser. 2, Fluids engineering, heat transfer, power, combustion, thermophysical properties

  JSME international journal. Ser. 2, Fluids engineering, heat transfer, power, combustion, thermophysical properties 32 (4), 568-573, 1989

  一般社団法人 日本機械学会

キーワード

• Flow Measurement
• Image Processing
• Flow Visualization
• Path-Line Picture
• Difference Method
• Velocity Distribution

詳細情報

• CRID: 1390001205426695424
• NII論文ID: 110002494299
• NII書誌ID: AA10680596
• DOI: 10.1299/jsmeb1988.32.4_568
• ISSN: 09148817
• Web Site: https://www.jstage.jst.go.jp/article/jsmeb1988/32/4/32_4_568/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可