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Marjavaara, Daniel
Publikationer (10 of 20) Visa alla publikationer
Burström, P., Frishfelds, V., Ljung, A.-L., Lundström, T. S. & Marjavaara, D. (2014). Grate aerodynamic: Model strategies for gas flow through a 2D iron ore pellet bed (ed.). Paper presented at European Fluid Mechanics Conference : 14/09/2014 - 18/09/2014. Paper presented at European Fluid Mechanics Conference : 14/09/2014 - 18/09/2014.
Öppna denna publikation i ny flik eller fönster >>Grate aerodynamic: Model strategies for gas flow through a 2D iron ore pellet bed
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2014 (Engelska)Konferensbidrag, Enbart muntlig presentation (Refereegranskat)
Nationell ämneskategori
Strömningsmekanik och akustik
Forskningsämne
Strömningslära
Identifikatorer
urn:nbn:se:ltu:diva-29976 (URN)39eac0f2-feca-4a34-9a2a-a497a9459101 (Lokalt ID)39eac0f2-feca-4a34-9a2a-a497a9459101 (Arkivnummer)39eac0f2-feca-4a34-9a2a-a497a9459101 (OAI)
Konferens
European Fluid Mechanics Conference : 14/09/2014 - 18/09/2014
Anmärkning
Godkänd; 2014; 20140923 (andbra)Tillgänglig från: 2016-09-30 Skapad: 2016-09-30 Senast uppdaterad: 2017-12-01Bibliografiskt granskad
Ljung, A.-L., Frishfelds, V., Lundström, T. S. & Marjavaara, D. (2012). Discrete and continuous modelling of heat and mass transport in drying of a bed of iron ore pellets (ed.). Paper presented at . Drying Technology, 30(7), 760-773
Öppna denna publikation i ny flik eller fönster >>Discrete and continuous modelling of heat and mass transport in drying of a bed of iron ore pellets
2012 (Engelska)Ingår i: Drying Technology, ISSN 0737-3937, E-ISSN 1532-2300, Vol. 30, nr 7, s. 760-773Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Drying of a porous bed of iron ore pellets is here considered by modeling a discrete two-dimensional system of round pellets. As a complement to the two-dimensional model, a continuous one-dimensional model enabling fast calculations is developed. Results from the discrete model show that the temperature front advances faster in areas with large distances between the pellets. In areas with low flow speed, the temperature of the pellets increases with a relatively slow rate. The water inside these pellets will therefore remain for a long time. The continuous model fits the discrete model very well for a regular distribution of equal-sized particles. A discrete model with irregular packing will, compared to the continuous model, show a larger variation in the distribution of temperature and moisture content in the final phase of drying.

Nationell ämneskategori
Strömningsmekanik och akustik
Forskningsämne
Strömningslära
Identifikatorer
urn:nbn:se:ltu:diva-3596 (URN)10.1080/07373937.2012.662567 (DOI)000303236100008 ()2-s2.0-84860202254 (Scopus ID)16c17696-70da-4f9b-abf9-b15454244f39 (Lokalt ID)16c17696-70da-4f9b-abf9-b15454244f39 (Arkivnummer)16c17696-70da-4f9b-abf9-b15454244f39 (OAI)
Anmärkning
Validerad; 2012; 20120215 (stlu)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2018-07-10Bibliografiskt granskad
Karlberg, M., Löfstrand, M., Marjavaara, D. & Lundström, T. S. (2012). Simulation driven processing function development, offering and operation (ed.). In: (Ed.), (Ed.), Proceedings of the ASME 2012 International Mechanical Engineering Congress & Exposition IMECE2012: November 9-15, 2012, Houston, Texas, USA. Paper presented at ASME 2012 International Mechanical Engineering Congress & Exposition : 09/11/2012 - 15/11/2012 (pp. 1561-1572). New York: American Society of Mechanical Engineers, 3
Öppna denna publikation i ny flik eller fönster >>Simulation driven processing function development, offering and operation
2012 (Engelska)Ingår i: Proceedings of the ASME 2012 International Mechanical Engineering Congress & Exposition IMECE2012: November 9-15, 2012, Houston, Texas, USA, New York: American Society of Mechanical Engineers , 2012, Vol. 3, s. 1561-1572Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

In today’s industry, functional provision is becoming more and more important, necessitating increased simulation support. In this paper, the objective is to present a modeling and simulation approach for simulation-driven design (SDD) to support function development. The scope of this paper is simulation support for developing hardware equipment used in processing industry. The research is founded on industrial needs identified through two parallel interview-based studies in the Swedish process industry. Both companies explore doing business with functional products rather than hardware, in scenarios where the responsibility for and availability of the functions may remain with the service provider. One as-is and one future (to-be) scenario are presented. A decomposition of a general processing function (applicable to both companies) describes how the companies transfer machine input to output specifications. The decomposition includes customer and provider value and the paper demonstrates, as part of the results and based on the SDD approach, how that value may be increased through evaluation and prioritization. Additionally, the SDD approach shows that it is possible to identify a set of solutions which meet the specified requirements, supporting evaluation and prioritization of business offers and activities.

Ort, förlag, år, upplaga, sidor
New York: American Society of Mechanical Engineers, 2012
Nyckelord
Engineering mechanics - Other engineering mechanics, Teknisk mekanik - Övrig teknisk mekanik
Nationell ämneskategori
Annan maskinteknik Strömningsmekanik och akustik
Forskningsämne
Datorstödd maskinkonstruktion; Strömningslära
Identifikatorer
urn:nbn:se:ltu:diva-37412 (URN)10.1115/IMECE2012-87548 (DOI)2-s2.0-84887286885 (Scopus ID)b6e6c445-3427-4c43-870e-0073b10c4715 (Lokalt ID)9780791845196 (ISBN)b6e6c445-3427-4c43-870e-0073b10c4715 (Arkivnummer)b6e6c445-3427-4c43-870e-0073b10c4715 (OAI)
Konferens
ASME 2012 International Mechanical Engineering Congress & Exposition : 09/11/2012 - 15/11/2012
Projekt
Fastelaboratoriet - VINNEXC
Anmärkning
Godkänd; 2012; 20130117 (ysko)Tillgänglig från: 2016-10-03 Skapad: 2016-10-03 Senast uppdaterad: 2018-07-10Bibliografiskt granskad
Marjavaara, D., Ebermark, S. & Lundström, S. (2009). Compression moulding simulations of SMC using a multi-objective surrogate-based inverse modeling approach (ed.). Mechanics of composite materials, 45(5), 503-515
Öppna denna publikation i ny flik eller fönster >>Compression moulding simulations of SMC using a multi-objective surrogate-based inverse modeling approach
2009 (Engelska)Ingår i: Mechanics of composite materials, ISSN 0191-5665, E-ISSN 1573-8922, Vol. 45, nr 5, s. 503-515Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A multiobjective surrogate-based inverse modeling technique to predict the spatial and temporal pressure distribution numerically during the fabrication of sheet moulding compounds (SMCs) is introduced. Specifically, an isotropic temperature-dependent Newtonian viscosity model of a SMC charge is fitted to experimental measurements via numerical simulations in order to mimic the temporal pressure distribution at two spatial locations simultaneously. The simulations are performed by using the commercial computational fluid dynamics (CFD) code ANSYS CFX-10.0, and the multiobjective surrogate-based fitting procedure proposed is carried out with a hybrid formulation of the NSGA-IIa evolutionary algorithm and the response surface methodology in Matlab. The outcome of the analysis shows the ability of the optimization framework to efficiently reduce the total computational load of the problem. Furthermore, the viscosity model assumed seems to be able to re solve the temporal pressure distribution and the advancing flow front accurately, which can not be said of the spatial pressure distribution. Hence, it is recommended to improve the CFD model proposed in order to better capture the true behaviour of the mould flow.

Nationell ämneskategori
Strömningsmekanik och akustik
Forskningsämne
Strömningslära
Identifikatorer
urn:nbn:se:ltu:diva-5852 (URN)10.1007/s11029-009-9109-2 (DOI)000272385000007 ()2-s2.0-75149120934 (Scopus ID)40a1e3f0-6bf3-11de-9f57-000ea68e967b (Lokalt ID)40a1e3f0-6bf3-11de-9f57-000ea68e967b (Arkivnummer)40a1e3f0-6bf3-11de-9f57-000ea68e967b (OAI)
Anmärkning

Validerad; 2009; 20090708 (stlu)

Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2018-07-10Bibliografiskt granskad
Marjavaara, D., Ebermark, S. & Lundström, S. (2008). Simulation of Compression moulding of SMC by using a multi-objective surrogate-based inverse modelling approach (ed.). In: (Ed.), (Ed.), Proceedings of the XV International Conference on Mechanics of Composites Material, MCM-2008: . Paper presented at International Conference on Mechanics of Composite Materials : 26/06/2008 - 30/06/2008.
Öppna denna publikation i ny flik eller fönster >>Simulation of Compression moulding of SMC by using a multi-objective surrogate-based inverse modelling approach
2008 (Engelska)Ingår i: Proceedings of the XV International Conference on Mechanics of Composites Material, MCM-2008, 2008Konferensbidrag, Meeting abstract (Övrigt vetenskapligt)
Nationell ämneskategori
Strömningsmekanik och akustik
Forskningsämne
Strömningslära
Identifikatorer
urn:nbn:se:ltu:diva-40429 (URN)f91b6c70-cb27-11dd-9935-000ea68e967b (Lokalt ID)f91b6c70-cb27-11dd-9935-000ea68e967b (Arkivnummer)f91b6c70-cb27-11dd-9935-000ea68e967b (OAI)
Konferens
International Conference on Mechanics of Composite Materials : 26/06/2008 - 30/06/2008
Anmärkning
Godkänd; 2008; 20081216 (stlu)Tillgänglig från: 2016-10-03 Skapad: 2016-10-03 Senast uppdaterad: 2017-11-25Bibliografiskt granskad
Marjavaara, D. (2007). CFD driven optimering av vattenvägarna i ett vattenkraftverk med hjälp av surrogatmodeller (ed.). In: (Ed.), Niklas Davidsson; Elianne Wassvik (Ed.), Svenska Mekanikdagar 2007: Program och abstracts. Paper presented at Svenska Mekanikdagar 2007 : 13/06/2007 - 15/06/2007 (pp. 55). Luleå: Luleå tekniska universitet
Öppna denna publikation i ny flik eller fönster >>CFD driven optimering av vattenvägarna i ett vattenkraftverk med hjälp av surrogatmodeller
2007 (Svenska)Ingår i: Svenska Mekanikdagar 2007: Program och abstracts / [ed] Niklas Davidsson; Elianne Wassvik, Luleå: Luleå tekniska universitet, 2007, s. 55-Konferensbidrag (Övrigt vetenskapligt)
Ort, förlag, år, upplaga, sidor
Luleå: Luleå tekniska universitet, 2007
Serie
Forskningsrapport / Luleå tekniska universitet, ISSN 1402-1528 ; 2007:10
Nationell ämneskategori
Strömningsmekanik och akustik
Forskningsämne
Strömningslära
Identifikatorer
urn:nbn:se:ltu:diva-27284 (URN)0b0979c0-5bb9-11dc-a955-000ea68e967b (Lokalt ID)0b0979c0-5bb9-11dc-a955-000ea68e967b (Arkivnummer)0b0979c0-5bb9-11dc-a955-000ea68e967b (OAI)
Konferens
Svenska Mekanikdagar 2007 : 13/06/2007 - 15/06/2007
Anmärkning

Godkänd; 2007; 20070905 (ysko)

Tillgänglig från: 2016-09-30 Skapad: 2016-09-30 Senast uppdaterad: 2018-02-27Bibliografiskt granskad
Marjavaara, D., Lundström, S., Goel, T., Mack, Y. & Shyy, W. (2007). Hydraulic turbine diffuser shape optimization by multiple surrogate model approximations of pareto fronts (ed.). Paper presented at . Journal of Fluids Engineering - Trancactions of The ASME, 129(9), 1228-1240
Öppna denna publikation i ny flik eller fönster >>Hydraulic turbine diffuser shape optimization by multiple surrogate model approximations of pareto fronts
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2007 (Engelska)Ingår i: Journal of Fluids Engineering - Trancactions of The ASME, ISSN 0098-2202, E-ISSN 1528-901X, Vol. 129, nr 9, s. 1228-1240Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A multiple surrogate-based optimization strategy in conjunction with an evolutionary algorithm has been employed to optimize the shape of a simplified hydraulic turbine diffuser utilizing three-dimensional Reynolds-averaged Navier-Stokes computational fluid dynamics solutions. Specifically, the diffuser performance is optimized by changing five geometric design variables to maximize the average pressure recovery factor for two inlet boundary conditions with different swirl, corresponding to different operating modes of the hydraulic turbine. Polynomial response surfaces and radial basis neural networks are used as surrogates, while a hybrid formulation of the NSGA-IIa evolutionary algorithm and a ε-constraint strategy is applied to construct the Pareto front from the two surrogates. The proposed optimization framework drastically reduces the computational load of the problem, compared to solely utilizing an evolutionary algorithm. For the present problem, the radial basis neural networks are more accurate near the Pareto front while the response surface performs better in regions away from it. By using a local resampling updating scheme the fidelity of both surrogates is improved, especially near the Pareto front. The optimal design yields larger wall angles, nonaxisymmetrical shapes, and delay in wall separation, resulting in 14.4% and 8.9% improvement, respectively, for the two inlet boundary conditions.

Nationell ämneskategori
Strömningsmekanik och akustik
Forskningsämne
Strömningslära
Identifikatorer
urn:nbn:se:ltu:diva-12464 (URN)10.1115/1.2754324 (DOI)000249352700015 ()2-s2.0-34748843385 (Scopus ID)b9e586b0-a59c-11db-9811-000ea68e967b (Lokalt ID)b9e586b0-a59c-11db-9811-000ea68e967b (Arkivnummer)b9e586b0-a59c-11db-9811-000ea68e967b (OAI)
Anmärkning
Validerad; 2007; 20070109 (ysko)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2018-07-10Bibliografiskt granskad
Hellström, G., Marjavaara, D. & Lundström, S. (2007). Parallel CFD simulations of an original and redesigned hydraulic turbine draft tube (ed.). Paper presented at . Advances in Engineering Software, 38(5), 338-344
Öppna denna publikation i ny flik eller fönster >>Parallel CFD simulations of an original and redesigned hydraulic turbine draft tube
2007 (Engelska)Ingår i: Advances in Engineering Software, ISSN 0965-9978, E-ISSN 1873-5339, Vol. 38, nr 5, s. 338-344Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The design of hydraulic turbine draft tubes has traditionally been based on simplified analytic methods, model and full-scale experiments. In the recent years the use of numerical methods such as computational fluid dynamics (CFD) has increased in the design process, due to the rapid escalation in computer performance. Today with parallel computer architectures, new aspects of flow can be considered. However, several problems have still to be solved before CFD can routinely be applied in product development. This paper aims to investigate the parallel performance of commercial CFD software on homogeneous computer networks, as common solutions encountered in the industry today. In addition, the efficiency improvements obtained in earlier experiments by modifying the shape of the draft tube will be considered, to deduce if the improvements can be captured with aid of CFD. Results from both the steady and the unsteady CFD simulations show that almost full scalability is obtained with the commercial CFD software CFX-5.7.1. Furthermore, no noticeable improvement in the pressure recovery factor or the flow field is noticed in the CFD simulations as compared to experiments. The discrepancy may be to the applied inlet boundary conditions and/or the turbulence model.

Nationell ämneskategori
Strömningsmekanik och akustik
Forskningsämne
Strömningslära
Identifikatorer
urn:nbn:se:ltu:diva-5548 (URN)10.1016/j.advengsoft.2006.08.013 (DOI)000245767000008 ()2-s2.0-33846794752 (Scopus ID)3ad99920-9fce-11db-8975-000ea68e967b (Lokalt ID)3ad99920-9fce-11db-8975-000ea68e967b (Arkivnummer)3ad99920-9fce-11db-8975-000ea68e967b (OAI)
Anmärkning
Validerad; 2007; Bibliografisk uppgift: Vol. title: High performance computing in science and engineering; 20070109 (ysko)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2018-07-10Bibliografiskt granskad
Ebermark, S., Marjavaara, D. & Lundström, S. (2007). Pressning av SMC: numeriska tryckfältsberäkningar med hjälp av inversmodellering (ed.). In: (Ed.), Niklas Davidsson; Elianne Wassvik (Ed.), Svenska Mekanikdagar 2007: Program och abstracts. Paper presented at Svenska Mekanikdagar 2007 : 13/06/2007 - 15/06/2007 (pp. 74). Luleå: Luleå tekniska universitet
Öppna denna publikation i ny flik eller fönster >>Pressning av SMC: numeriska tryckfältsberäkningar med hjälp av inversmodellering
2007 (Svenska)Ingår i: Svenska Mekanikdagar 2007: Program och abstracts / [ed] Niklas Davidsson; Elianne Wassvik, Luleå: Luleå tekniska universitet, 2007, s. 74-Konferensbidrag, Meeting abstract (Övrigt vetenskapligt)
Ort, förlag, år, upplaga, sidor
Luleå: Luleå tekniska universitet, 2007
Serie
Forskningsrapport / Luleå tekniska universitet, ISSN 1402-1528 ; 2007:10
Nationell ämneskategori
Strömningsmekanik och akustik
Forskningsämne
Strömningslära
Identifikatorer
urn:nbn:se:ltu:diva-31084 (URN)5249c640-5bbf-11dc-a955-000ea68e967b (Lokalt ID)5249c640-5bbf-11dc-a955-000ea68e967b (Arkivnummer)5249c640-5bbf-11dc-a955-000ea68e967b (OAI)
Konferens
Svenska Mekanikdagar 2007 : 13/06/2007 - 15/06/2007
Anmärkning
Godkänd; 2007; 20070905 (ysko)Tillgänglig från: 2016-09-30 Skapad: 2016-09-30 Senast uppdaterad: 2017-11-25Bibliografiskt granskad
Marjavaara, D. & Lundström, S. (2007). Response surface-based shape optimization of a Francis draft tube (ed.). Paper presented at . International journal of numerical methods for heat & fluid flow, 17(1), 34-45
Öppna denna publikation i ny flik eller fönster >>Response surface-based shape optimization of a Francis draft tube
2007 (Engelska)Ingår i: International journal of numerical methods for heat & fluid flow, ISSN 0961-5539, E-ISSN 1758-6585, Vol. 17, nr 1, s. 34-45Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Purpose - This paper aims to develop an efficient and accurate numerical method that can be used in the design process of the waterways in a hydropower plant. Design/methodology/approach - A range of recently published (2002-2006) works, which aim to form the basis of a shape optimization tool for flow design and to increase the knowledge within the field of computational fluid dynamics (CFD) and surrogate-based optimization techniques. Findings - Provides information about how crude the optimization method can be regarding, for example, the design variables, the numerical noise and the multi objectives, etc. Research limitations/implications - It does not give a detailed interpretation of the flow behaviour due to the lack of validation data. Practical implications - A very useful flow design methodology that can be used in both academy and industry. Originality/value - Shape optimization of hydraulic turbine draft tubes with aid of CFD and numerical optimization techniques has not been performed until recently due to the high CPU requirements on CFD simulations. The paper investigates the possibilities of using the global optimization algorithm response surface methodology in the design process of a full scale hydraulic turbine draft tube.

Nationell ämneskategori
Strömningsmekanik och akustik
Forskningsämne
Strömningslära
Identifikatorer
urn:nbn:se:ltu:diva-3189 (URN)10.1108/09615530710716072 (DOI)000243958400003 ()2-s2.0-33845806555 (Scopus ID)0fb15c50-9fcf-11db-8975-000ea68e967b (Lokalt ID)0fb15c50-9fcf-11db-8975-000ea68e967b (Arkivnummer)0fb15c50-9fcf-11db-8975-000ea68e967b (OAI)
Anmärkning
Validerad; 2007; 20070109 (ysko)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2018-07-10Bibliografiskt granskad

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