{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T03:03:51Z","timestamp":1760238231721,"version":"build-2065373602"},"reference-count":24,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2020,7,29]],"date-time":"2020-07-29T00:00:00Z","timestamp":1595980800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["51879122","51579117","51779106"],"award-info":[{"award-number":["51879122","51579117","51779106"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Zhenjiang key research and development plan","award":["GY2017001","GY2018025"],"award-info":[{"award-number":["GY2017001","GY2018025"]}]},{"name":"the Open Research Subject of Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University","award":["szjj2017-094","szjj2016-068"],"award-info":[{"award-number":["szjj2017-094","szjj2016-068"]}]},{"name":"Sichuan Provincial Key Lab of Process Equipment and Control","award":["GK201614","GK201816"],"award-info":[{"award-number":["GK201614","GK201816"]}]},{"name":"Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) and Six Talent Peaks Project in Jiangsu Province","award":["GDZB-017"],"award-info":[{"award-number":["GDZB-017"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Symmetry"],"abstract":"<jats:p>The existing definition method of filter grid scale in a Detached Eddy Simulation (DES) hybrid model is unreasonable, which will lead to the unreasonable trigger of a boundary layer large eddy simulation and reduce computational efficiency. In view of this problem, the filter grid scale is discussed in this paper. The 90\u00b0 square curved elbow is selected as the research object. The effects of three grid definition methods: geometric mean (\u0394GM), arithmetic mean (\u0394AM) and quadratic mean (\u0394QM) on the simulation results of the DES model are compared, and the velocity distribution of the flow cross section and the distribution of the flow pressure coefficient on the outer arc surface are compared with the experimental results of Taylor. The results show that the order of the three definition methods is \u0394GM\u2264\u0394AM\u2264\u0394QM. Meanwhile, within 30\u00b0 &lt; polar angle(\u03b8) &lt; 75\u00b0, the results are closer to the experiment, and the development trends and numerical values of \u0394AM and \u0394QM are closer to the experiment in general. However, when \u03b8 &gt; 60\u00b0, the value of \u0394QM is slightly closer to the experimental result than \u0394AM. \u0394QM is more suitable for calculating the internal flow in a curved elbow than the other two methods.<\/jats:p>","DOI":"10.3390\/sym12081252","type":"journal-article","created":{"date-parts":[[2020,7,30]],"date-time":"2020-07-30T12:15:38Z","timestamp":1596111338000},"page":"1252","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Research and Application of Filtering Grid Scale in Detached Eddy Simulation Model"],"prefix":"10.3390","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0678-4382","authenticated-orcid":false,"given":"Liang","family":"Dong","sequence":"first","affiliation":[{"name":"Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China"}]},{"given":"Chao","family":"Guo","sequence":"additional","affiliation":[{"name":"Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China"}]},{"given":"Ying","family":"Wang","sequence":"additional","affiliation":[{"name":"Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China"}]},{"given":"Houlin","family":"Liu","sequence":"additional","affiliation":[{"name":"Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6965-7906","authenticated-orcid":false,"given":"Cui","family":"Dai","sequence":"additional","affiliation":[{"name":"School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China"}]}],"member":"1968","published-online":{"date-parts":[[2020,7,29]]},"reference":[{"key":"ref_1","unstructured":"Shi, X.G. 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