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Dasht, Johan
Publications (9 of 9) Show all publications
Dasht, J., Engström, J., Kufner, A. & Persson, L.-E. (2006). Rothe's method for parabolic equations on non-cylindrical domains (ed.). Paper presented at . Advances in Algebra and Analysis, 1(1), 59-80
Open this publication in new window or tab >>Rothe's method for parabolic equations on non-cylindrical domains
2006 (English)In: Advances in Algebra and Analysis, ISSN 0973-2306, Vol. 1, no 1, p. 59-80Article in journal (Refereed) Published
National Category
Mathematical Analysis
Research subject
Mathematics
Identifiers
urn:nbn:se:ltu:diva-15362 (URN)edd2ca40-c7ee-11db-98d9-000ea68e967b (Local ID)edd2ca40-c7ee-11db-98d9-000ea68e967b (Archive number)edd2ca40-c7ee-11db-98d9-000ea68e967b (OAI)
Note
Godkänd; 2006; 20070301 (evan)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Almqvist, A. & Dasht, J. (2006). The homogenization process of the Reynolds equation describing compressible liquid flow (ed.). Tribology International, 39(9), 994-1002
Open this publication in new window or tab >>The homogenization process of the Reynolds equation describing compressible liquid flow
2006 (English)In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 39, no 9, p. 994-1002Article in journal (Refereed) Published
Abstract [en]

This paper summarizes the homogenization process of rough, hydrodynamic lubrication problems governed by the Reynolds equation used to describe compressible liquid flow. Here, the homogenized equation describes the limiting result when the wavelength of a modeled surface roughness goes to zero. The lubricant film thickness is modeled by one part describing the geometry/shape of the bearing and a periodic part describing the surface topography/roughness. By varying the periodic part as well as its wavelength, we can try to systematically investigate the applicability of homogenization on this type of problem. The load carrying capacity is the target parameter; deterministic solutions are compared to homogenized by this measure. We show that the load carrying capacity rapidly converges to the homogenized results as the wavelength decreases, proving that the homogenized solution gives a very accurate representation of the problem when real surface topographies are considered

National Category
Mathematical Analysis Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Mathematics; Machine Elements
Identifiers
urn:nbn:se:ltu:diva-2394 (URN)10.1016/j.triboint.2005.09.036 (DOI)000239981200019 ()2-s2.0-33746300511 (Scopus ID)001b0310-c264-11db-9ea3-000ea68e967b (Local ID)001b0310-c264-11db-9ea3-000ea68e967b (Archive number)001b0310-c264-11db-9ea3-000ea68e967b (OAI)
Note

Validerad; 2006; 20061109 (cira)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Almqvist, A., Glavatskih, S., Larsson, R., Marklund, P., Sahlin, F., Dasht, J., . . . Wall, P. (2005). Homogenization of Reynolds equation (ed.). Paper presented at . Luleå: Department of Mathematics, Luleå University of Technology
Open this publication in new window or tab >>Homogenization of Reynolds equation
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2005 (English)Report (Other academic)
Place, publisher, year, edition, pages
Luleå: Department of Mathematics, Luleå University of Technology, 2005. p. 20
Series
Gula serien, ISSN 1400-4003 ; 2005:03
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear) Mathematical Analysis
Research subject
Machine Elements; Mathematics
Identifiers
urn:nbn:se:ltu:diva-24700 (URN)c1a57ae0-c0db-11db-834c-000ea68e967b (Local ID)c1a57ae0-c0db-11db-834c-000ea68e967b (Archive number)c1a57ae0-c0db-11db-834c-000ea68e967b (OAI)
Note
Godkänd; 2005; 20120822 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-03-09Bibliographically approved
Almqvist, A., Dasht, J., Glavatskih, S., Larsson, R., Marklund, P., Persson, L.-E., . . . Wall, P. (2005). Homogenization of the Reynolds equation (ed.). Paper presented at . Luleå: Department of Mathematics, Luleå University of Technology
Open this publication in new window or tab >>Homogenization of the Reynolds equation
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2005 (English)Report (Other academic)
Place, publisher, year, edition, pages
Luleå: Department of Mathematics, Luleå University of Technology, 2005. p. 47
Series
Gula serien, ISSN 1400-4003 ; 2005:03
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear) Mathematical Analysis
Research subject
Machine Elements; Mathematics
Identifiers
urn:nbn:se:ltu:diva-21950 (URN)0dabe211-ea37-49f2-898a-1b59f251e0b0 (Local ID)0dabe211-ea37-49f2-898a-1b59f251e0b0 (Archive number)0dabe211-ea37-49f2-898a-1b59f251e0b0 (OAI)
Note
Godkänd; 2005; 20130115 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-03-09Bibliographically approved
Dasht, J. (2005). Some developments of homogenization theory and Rothe's method (ed.). (Licentiate dissertation). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Some developments of homogenization theory and Rothe's method
2005 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis is devoted to homogenization theory and some generalizations of Rothe's method to non-cylindrical domains. It consists of two introductory chapters and four papers. Chapters 1 and 2 serve as a self-contained overview to the theory of homogenization. In the introduction we present the idea behind homogenization theory and in the second chapter some further results in homogenization theory are presented and some of the homogenization results from chapter 1 are proved. Paper A deals with a numerical study of stochastic homogenization and paper B deals with some generalizations of Rothe's method to non-cylindrical domains. Paper C is devoted to numerical analysis of the convergence in homogenization of composites and finally the degeneracy in stochastic homogenization is considered in the paper D.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2005. p. 38
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757 ; 2005:05
National Category
Mathematical Analysis
Research subject
Mathematics
Identifiers
urn:nbn:se:ltu:diva-17449 (URN)36f78ce0-9b00-11db-8975-000ea68e967b (Local ID)36f78ce0-9b00-11db-8975-000ea68e967b (Archive number)36f78ce0-9b00-11db-8975-000ea68e967b (OAI)
Note
Godkänd; 2005; 20070103 (haneit)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Byström, J., Dasht, J. & Wall, P. (2004). A numerical study of the convergence in stochastic homogenization (ed.). Paper presented at . Journal of Analysis and Applications, 2(3), 159-171
Open this publication in new window or tab >>A numerical study of the convergence in stochastic homogenization
2004 (English)In: Journal of Analysis and Applications, ISSN 0972-5954, Vol. 2, no 3, p. 159-171Article in journal (Refereed) Published
Abstract [en]

This note makes the link between theoretical results on stochastic homogenization and effective computation of averaged coefficients for diffusion operators in random media. Examples of how to construct relevant random media and numerical results on the effective coefficients are given.

National Category
Mathematical Analysis
Research subject
Mathematics
Identifiers
urn:nbn:se:ltu:diva-15394 (URN)ee6e4250-a641-11db-9811-000ea68e967b (Local ID)ee6e4250-a641-11db-9811-000ea68e967b (Archive number)ee6e4250-a641-11db-9811-000ea68e967b (OAI)
Note
Validerad; 2004; 20070107 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Byström, J., Dasht, J. & Wall, P. (2003). A numerical study of stochastic homogenization (ed.). In: (Ed.), David Hui (Ed.), Proceedings of the International Conference on Composites Engineering: ICCE/10. Paper presented at International Conference on Composites Engineering : 20/07/2003 - 26/07/2003.
Open this publication in new window or tab >>A numerical study of stochastic homogenization
2003 (English)In: Proceedings of the International Conference on Composites Engineering: ICCE/10 / [ed] David Hui, 2003Conference paper, Published paper (Refereed)
National Category
Mathematical Analysis
Research subject
Mathematics
Identifiers
urn:nbn:se:ltu:diva-31332 (URN)57bfe330-5baf-11dc-a955-000ea68e967b (Local ID)57bfe330-5baf-11dc-a955-000ea68e967b (Archive number)57bfe330-5baf-11dc-a955-000ea68e967b (OAI)
Conference
International Conference on Composites Engineering : 20/07/2003 - 26/07/2003
Note
Godkänd; 2003; 20070905 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Dasht, J., Engström, J. & Persson, L.-E. (2003). Degeneracy in stochastic homogenization (ed.). In: (Ed.), David Hui (Ed.), Proceedings of the International Conference on Composites Engineering: ICCE/10. Paper presented at International Conference on Composites Engineering : 20/07/2003 - 26/07/2003.
Open this publication in new window or tab >>Degeneracy in stochastic homogenization
2003 (English)In: Proceedings of the International Conference on Composites Engineering: ICCE/10 / [ed] David Hui, 2003Conference paper, Published paper (Refereed)
National Category
Mathematical Analysis
Research subject
Mathematics
Identifiers
urn:nbn:se:ltu:diva-40127 (URN)f1f4d0f0-5baf-11dc-a955-000ea68e967b (Local ID)f1f4d0f0-5baf-11dc-a955-000ea68e967b (Archive number)f1f4d0f0-5baf-11dc-a955-000ea68e967b (OAI)
Conference
International Conference on Composites Engineering : 20/07/2003 - 26/07/2003
Note
Godkänd; 2003; 20070905 (ysko)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved
Dasht, J., Engström, J. & Wall, P. (2002). Numerical analysis of the convergence in homogenization of composites (ed.). In: (Ed.), David Hui (Ed.), Proceedings of the International Conference on Composites Engineering: ICCE/9. Paper presented at Numerical analysis of the convergence in homogenization of composites : 01/07/2002 - 06/07/2002.
Open this publication in new window or tab >>Numerical analysis of the convergence in homogenization of composites
2002 (English)In: Proceedings of the International Conference on Composites Engineering: ICCE/9 / [ed] David Hui, 2002Conference paper, Published paper (Refereed)
National Category
Mathematical Analysis
Research subject
Mathematics
Identifiers
urn:nbn:se:ltu:diva-34007 (URN)818ef8a0-5bae-11dc-a955-000ea68e967b (Local ID)818ef8a0-5bae-11dc-a955-000ea68e967b (Archive number)818ef8a0-5bae-11dc-a955-000ea68e967b (OAI)
Conference
Numerical analysis of the convergence in homogenization of composites : 01/07/2002 - 06/07/2002
Note
Godkänd; 2002; 20070905 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved

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