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f | 1 | { | f | 1 | { |
2 | "author": "Neuhauser, Jonathan", | 2 | "author": "Neuhauser, Jonathan", | ||
3 | "author_email": "", | 3 | "author_email": "", | ||
4 | "creator_user_id": "17755db4-395a-4b3b-ac09-e8e3484ca700", | 4 | "creator_user_id": "17755db4-395a-4b3b-ac09-e8e3484ca700", | ||
5 | "doi": "10.35097/1339", | 5 | "doi": "10.35097/1339", | ||
6 | "doi_date_published": "2023", | 6 | "doi_date_published": "2023", | ||
7 | "doi_publisher": "", | 7 | "doi_publisher": "", | ||
8 | "doi_status": "True", | 8 | "doi_status": "True", | ||
9 | "extra_authors": [ | 9 | "extra_authors": [ | ||
10 | { | 10 | { | ||
11 | "extra_author": "Sch\u00e4fer, Kay", | 11 | "extra_author": "Sch\u00e4fer, Kay", | ||
12 | "orcid": "0000-0002-1704-8233" | 12 | "orcid": "0000-0002-1704-8233" | ||
13 | }, | 13 | }, | ||
14 | { | 14 | { | ||
15 | "extra_author": "Gatti, Davide", | 15 | "extra_author": "Gatti, Davide", | ||
16 | "orcid": "" | 16 | "orcid": "" | ||
17 | }, | 17 | }, | ||
18 | { | 18 | { | ||
19 | "extra_author": "Frohnapfel, Bettina", | 19 | "extra_author": "Frohnapfel, Bettina", | ||
20 | "orcid": "" | 20 | "orcid": "" | ||
21 | } | 21 | } | ||
22 | ], | 22 | ], | ||
23 | "groups": [], | 23 | "groups": [], | ||
24 | "id": "7490c59a-e5d0-4979-b2a3-3c004027433a", | 24 | "id": "7490c59a-e5d0-4979-b2a3-3c004027433a", | ||
25 | "isopen": false, | 25 | "isopen": false, | ||
26 | "license_id": "CC BY 4.0 Attribution", | 26 | "license_id": "CC BY 4.0 Attribution", | ||
27 | "license_title": "CC BY 4.0 Attribution", | 27 | "license_title": "CC BY 4.0 Attribution", | ||
28 | "metadata_created": "2023-08-04T08:50:34.132114", | 28 | "metadata_created": "2023-08-04T08:50:34.132114", | ||
t | 29 | "metadata_modified": "2023-08-04T09:04:11.874482", | t | 29 | "metadata_modified": "2023-08-04T09:29:05.452497", |
30 | "name": "rdr-doi-10-35097-1339", | 30 | "name": "rdr-doi-10-35097-1339", | ||
31 | "notes": "Abstract: Heterogeneous roughness in the form of | 31 | "notes": "Abstract: Heterogeneous roughness in the form of | ||
32 | streamwise aligned strips is known to generate large scale secondary | 32 | streamwise aligned strips is known to generate large scale secondary | ||
33 | motions under turbulent flow conditions that can induce the intriguing | 33 | motions under turbulent flow conditions that can induce the intriguing | ||
34 | feature of larger flow rates above rough than smooth surface parts. | 34 | feature of larger flow rates above rough than smooth surface parts. | ||
35 | The hydrodynamical definition of a surface roughness includes a large | 35 | The hydrodynamical definition of a surface roughness includes a large | ||
36 | scale separation between the roughness height and the boundary layer | 36 | scale separation between the roughness height and the boundary layer | ||
37 | thickness which is directly related to the fact that the drag of a | 37 | thickness which is directly related to the fact that the drag of a | ||
38 | laminar flow is not altered by the presence of roughness. Existing | 38 | laminar flow is not altered by the presence of roughness. Existing | ||
39 | simplified approaches for direct numerical simulation (DNS) of | 39 | simplified approaches for direct numerical simulation (DNS) of | ||
40 | roughness strips do not fulfill this requirement of an unmodified | 40 | roughness strips do not fulfill this requirement of an unmodified | ||
41 | laminar base flow compared to a smooth wall reference. It is shown | 41 | laminar base flow compared to a smooth wall reference. It is shown | ||
42 | that disturbances induced in a modified laminar base flow can trigger | 42 | that disturbances induced in a modified laminar base flow can trigger | ||
43 | large scale motions with resemblance to turbulent secondary flow. | 43 | large scale motions with resemblance to turbulent secondary flow. | ||
44 | \r\nWe propose a simple roughness model that allows to capture the | 44 | \r\nWe propose a simple roughness model that allows to capture the | ||
45 | particular features of turbulent secondary flow without impacting the | 45 | particular features of turbulent secondary flow without impacting the | ||
46 | laminar base flow. The roughness model is based on the prescription of | 46 | laminar base flow. The roughness model is based on the prescription of | ||
47 | a spanwise slip length, a quantity that can directly be translated | 47 | a spanwise slip length, a quantity that can directly be translated | ||
48 | into the Hama roughness function for a homogeneous rough surface. The | 48 | into the Hama roughness function for a homogeneous rough surface. The | ||
49 | heterogeneous application of the slip length boundary condition | 49 | heterogeneous application of the slip length boundary condition | ||
50 | results in very good agreement with existing experimental data in | 50 | results in very good agreement with existing experimental data in | ||
51 | terms of the secondary flow topology. \r\nIn addition, the proposed | 51 | terms of the secondary flow topology. \r\nIn addition, the proposed | ||
52 | modelling approach allows to quantitatively evaluate the drag | 52 | modelling approach allows to quantitatively evaluate the drag | ||
53 | increasing contribution of the secondary flow. Both the secondary flow | 53 | increasing contribution of the secondary flow. Both the secondary flow | ||
54 | itself and the related drag increase reveal a very small dependence on | 54 | itself and the related drag increase reveal a very small dependence on | ||
55 | the gradient of the transition between rough and smooth surface parts | 55 | the gradient of the transition between rough and smooth surface parts | ||
56 | only. Interestingly, the observed drag increase due to secondary flows | 56 | only. Interestingly, the observed drag increase due to secondary flows | ||
57 | above the modelled roughness is significantly smaller than the one | 57 | above the modelled roughness is significantly smaller than the one | ||
58 | previously reported for roughness resolving simulations. We | 58 | previously reported for roughness resolving simulations. We | ||
59 | hypothesize that this difference arises from the fact that roughness | 59 | hypothesize that this difference arises from the fact that roughness | ||
60 | resolving simulations cannot truly fulfill the requirement of large | 60 | resolving simulations cannot truly fulfill the requirement of large | ||
61 | scale separation.\r\nTechnicalRemarks: The data for all simulations | 61 | scale separation.\r\nTechnicalRemarks: The data for all simulations | ||
62 | discussed in the main paper are provided as Numpy npz files. See the | 62 | discussed in the main paper are provided as Numpy npz files. See the | ||
63 | readme file for a detailed description of the file contents.", | 63 | readme file for a detailed description of the file contents.", | ||
64 | "num_resources": 0, | 64 | "num_resources": 0, | ||
65 | "num_tags": 0, | 65 | "num_tags": 0, | ||
66 | "orcid": "0000-0003-3288-6056", | 66 | "orcid": "0000-0003-3288-6056", | ||
67 | "organization": { | 67 | "organization": { | ||
68 | "approval_status": "approved", | 68 | "approval_status": "approved", | ||
69 | "created": "2023-01-12T13:30:23.238233", | 69 | "created": "2023-01-12T13:30:23.238233", | ||
70 | "description": "RADAR (Research Data Repository) is a | 70 | "description": "RADAR (Research Data Repository) is a | ||
71 | cross-disciplinary repository for archiving and publishing research | 71 | cross-disciplinary repository for archiving and publishing research | ||
72 | data from completed scientific studies and projects. The focus is on | 72 | data from completed scientific studies and projects. The focus is on | ||
73 | research data from subjects that do not yet have their own | 73 | research data from subjects that do not yet have their own | ||
74 | discipline-specific infrastructures for research data management. ", | 74 | discipline-specific infrastructures for research data management. ", | ||
75 | "id": "013c89a9-383c-4200-8baa-0f78bf1d91f9", | 75 | "id": "013c89a9-383c-4200-8baa-0f78bf1d91f9", | ||
76 | "image_url": "radar-logo.svg", | 76 | "image_url": "radar-logo.svg", | ||
77 | "is_organization": true, | 77 | "is_organization": true, | ||
78 | "name": "radar", | 78 | "name": "radar", | ||
79 | "state": "active", | 79 | "state": "active", | ||
80 | "title": "RADAR", | 80 | "title": "RADAR", | ||
81 | "type": "organization" | 81 | "type": "organization" | ||
82 | }, | 82 | }, | ||
83 | "owner_org": "013c89a9-383c-4200-8baa-0f78bf1d91f9", | 83 | "owner_org": "013c89a9-383c-4200-8baa-0f78bf1d91f9", | ||
84 | "private": false, | 84 | "private": false, | ||
85 | "production_year": "2022", | 85 | "production_year": "2022", | ||
86 | "publication_year": "2023", | 86 | "publication_year": "2023", | ||
87 | "publishers": [ | 87 | "publishers": [ | ||
88 | { | 88 | { | ||
89 | "publisher": "Karlsruhe Institute of Technology" | 89 | "publisher": "Karlsruhe Institute of Technology" | ||
90 | } | 90 | } | ||
91 | ], | 91 | ], | ||
92 | "relationships_as_object": [], | 92 | "relationships_as_object": [], | ||
93 | "relationships_as_subject": [], | 93 | "relationships_as_subject": [], | ||
94 | "repository_name": "RADAR (Research Data Repository)", | 94 | "repository_name": "RADAR (Research Data Repository)", | ||
95 | "resources": [], | 95 | "resources": [], | ||
96 | "services_used_list": "", | 96 | "services_used_list": "", | ||
97 | "source_metadata_created": "2023", | 97 | "source_metadata_created": "2023", | ||
98 | "source_metadata_modified": "", | 98 | "source_metadata_modified": "", | ||
99 | "state": "active", | 99 | "state": "active", | ||
100 | "subject_areas": [ | 100 | "subject_areas": [ | ||
101 | { | 101 | { | ||
102 | "subject_area_additional": "", | 102 | "subject_area_additional": "", | ||
103 | "subject_area_name": "Engineering" | 103 | "subject_area_name": "Engineering" | ||
104 | } | 104 | } | ||
105 | ], | 105 | ], | ||
106 | "tags": [], | 106 | "tags": [], | ||
107 | "title": "Dataset: simulation of turbulent flow over roughness | 107 | "title": "Dataset: simulation of turbulent flow over roughness | ||
108 | strips", | 108 | strips", | ||
109 | "type": "vdataset", | 109 | "type": "vdataset", | ||
110 | "url": "https://doi.org/10.35097/1339" | 110 | "url": "https://doi.org/10.35097/1339" | ||
111 | } | 111 | } |