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In [http://e6.ijs.si/ParallelAndDistributedSystems/ '''Parallel and Distributed Systems Laboratory'''] we are working on a C++ library that is first and foremost focused on tools for solving Partial Differential Equations by meshless methods. The basic idea is to create generic codes for tools that are needed for solving not only PDEs but many other problems, e.g. Moving Least Squares approximation, kD-tree, domain generation engines, etc. We call this open source meshless project '''Medusa: Coordinate Free Mehless Method implementation (MM).
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'''Welcome to the Medusa wiki. To visit the main website, go to [http://e6.ijs.si/medusa/ http://e6.ijs.si/medusa/].'''
  
Technical details about code, examples, and can be found on our [http://e6.ijs.si/medusa/docs/ '''documentation page'''] and [https://gitlab.com/e62Lab/medusa '''the code''']. [[File:C.png|100px||link=https://gitlab.com/e62Lab/medusa|alt=Alt text|code]] [[File:doxygen.png|100px|link=http://e6.ijs.si/medusa/docs/|alt=Alt text|Documentation page]]
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In [http://e6.ijs.si/ParallelAndDistributedSystems/ Parallel and Distributed Systems Laboratory] we are working on a C++ library that is first and foremost focused on tools for solving Partial Differential Equations by meshless methods. The basic idea is to create generic codes for tools that are needed for solving not only PDEs but many other problems, e.g. Moving Least Squares approximation, $k$-d tree, domain generation engines, etc.
 +
We call this open source meshless project [http://e6.ijs.si/medusa/ Medusa: Coordinate Free Meshless Method implementation (MM)].
 +
 
 +
Technical details about code and examples  can be found on our [http://e6.ijs.si/medusa/docs/ documentation page] and [https://gitlab.com/e62Lab/medusa Gitlab repository]. [[File:C.png|100px||link=https://gitlab.com/e62Lab/medusa|alt=Alt text|code]] [[File:doxygen.png|100px|link=http://e6.ijs.si/medusa/docs/|alt=Alt text|Documentation page]]
  
 
This wiki site is meant for more relaxed discussions about general principles, possible and already implemented applications, preliminary analyses, etc.
 
This wiki site is meant for more relaxed discussions about general principles, possible and already implemented applications, preliminary analyses, etc.
 
Note, that there are many grammatical mistakes, typos, stupid sentences, etc. This wiki is meant for quick information exchange and therefore we do not invest a lot of energy into styling :).   
 
Note, that there are many grammatical mistakes, typos, stupid sentences, etc. This wiki is meant for quick information exchange and therefore we do not invest a lot of energy into styling :).   
 +
 +
== Documentation ==
 +
* [https://gitlab.com/e62Lab/medusa Code on Gitlab]
 +
* [[How to build | Installation and building]]
 +
* [[Including this library in your project | Including this library in your project]]
 +
* [[Testing | Running tests]]
 +
* [http://e6.ijs.si/medusa/docs/ Technical documentation]
 +
* [[Coding style | Coding style]]
 +
* [[Wiki editing guide | Wiki editing and backup guide]]
  
 
== Building blocks ==
 
== Building blocks ==
* [[Moving Least Squares (MLS)]]
+
Medusa is modular coordinate-free parallel implementation of a numerical framework designed, but not limited to, for solving PDEs. In this section we present main modules of the library that can be also used as a standalone tools.
* [[Kd Tree]]
 
 
* [[Positioning of computational nodes]]  
 
* [[Positioning of computational nodes]]  
* [[Meshless Local Strong Form Method (MLSM)]]
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* [[Relaxation of the nodal distribution]]
 +
* [[Refinement of the nodal distribution]]
 +
* [[k-d tree|''k''-d tree and other spatial search structures]]
 +
* [[Solving system | Solving linear system - including over and underdetermined systems]]
 +
* [[Weighted Least Squares (WLS)]]
 
* [[Computation of shape functions]]
 
* [[Computation of shape functions]]
 +
* [[Radial basis function-generated finite differences (RBF-FD)]]
 +
* [[Ghost nodes (theory)]]
 
* [[Integrators for time stepping]]
 
* [[Integrators for time stepping]]
  
== Examples (work in progress) ==
+
== Examples ==
 +
In this section we present exact examples. Each of the below solutions can be found also in in the repository under examples. More explanation about the physical background and solution procedure can be found in following sections.
 
* [[Philosophy of examples and how to run them]]
 
* [[Philosophy of examples and how to run them]]
 
* [[Poisson's equation]]
 
* [[Poisson's equation]]
 +
* [[Heat equation]]
 
* [[Linear elasticity]]
 
* [[Linear elasticity]]
 +
* [[Complex-valued problems]]
 +
* [[Coupled domains]]
 +
* [[Parametric domains | Parametric domains &ndash; Curved surface with variable density]]
 +
* [[NURBS domains | Domains modeled with non-uniform rational basis splines (NURBS)]]
 +
* [[Determining the interior of the domain by oversampling the boundary]]
 +
* [[Computer-aided design - Importing IGES and STEP files]]
 +
* [[Realistic 3D models|Working with 3D surface mesh models ]]
 +
* [[customization | Operator customization]]
 +
* [[Ghost nodes]]
 +
* [[Electromagnetic scattering]]
 +
* [[Schrödinger equation]]
 +
* [[Wave equation]]
 +
* [[Cahn-Hilliard equation]]
 
* [[Fluid mechanics]]
 
* [[Fluid mechanics]]
* [[Wave equation]]
+
* [[Solid Mechanics | Solid mechanics]]
  
== Applications / Examples ==
+
== Discussions / Applications ==
* Basic PDE solutions
+
This section is meant for general discussion about the physical background of the examples, the solution procedures, various applications, etc. Note, that code snippets presented in discussion might not reflect the actual state of Medusa. 
** [[Heat Poisson's equation | Convection Diffusion equation]]
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* [[Convection Diffusion equation | Convection Diffusion equation]]
** [[Quantum Mechanics | Schrödinger equation]]
+
* [[Adaptivity|H-adaptivity]]
**[[Wave equation application]]  
+
* [[Hp-adaptivity]]
 
* [[Solid Mechanics]]
 
* [[Solid Mechanics]]
 
** [[Point contact]]
 
** [[Point contact]]
 
** [[Hertzian contact]]
 
** [[Hertzian contact]]
 
** [[Cantilever beam]]
 
** [[Cantilever beam]]
** [[FWO case]]
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** [[Fretting fatigue case]]
 +
** [[Plasticity]]
 
* [[Fluid Mechanics]]
 
* [[Fluid Mechanics]]
 
** [[Lid driven cavity]]
 
** [[Lid driven cavity]]
 +
** [[Burgers' equation]]
 
** [[de Vahl Davis natural convection test]]
 
** [[de Vahl Davis natural convection test]]
 +
** [[Natural convection in 3D irregular domain]]
 
** [[Natural convection from heated cylinder]]
 
** [[Natural convection from heated cylinder]]
 
** [[Natural convection between concentric cylinders]]
 
** [[Natural convection between concentric cylinders]]
 +
** [[Non-Newtonian fluid]]
 +
* [[Computational electromagnetics]]
 +
** [[Triple dielectric step in 1D]]
 +
** [[Scattering from an infinite cylinder]]
 +
** [[Point source near an anisotropic lens]]
 
* Other applications
 
* Other applications
 
** [[Attenuation due to liquid water content in the atmosphere|Attenuation of a satellite communication]]
 
** [[Attenuation due to liquid water content in the atmosphere|Attenuation of a satellite communication]]
 
** [[Heart rate variability detection]]
 
** [[Heart rate variability detection]]
 +
** [[Bioheat equation]]
 +
* [[Meshless FDM]]
  
 
== Performance analyses ==
 
== Performance analyses ==
Line 47: Line 89:
 
* [[Solving sparse systems]]
 
* [[Solving sparse systems]]
 
* [[Eigen paralelization]]
 
* [[Eigen paralelization]]
 
== Documentation ==
 
* [https://gitlab.com/e62Lab/medusa Code on Gitlab]
 
* [[How to build | Installation and building]]
 
* [[Testing | Running unit tests]]
 
* [http://e6.ijs.si/medusa/docs/ Technical documentation]
 
* [[Coding style | Coding style]]
 
* [[Including this library in your project | Including this library in your project]]
 
* [[Wiki editing guide | Wiki editing and backup guide]]
 
  
 
== Last changes ==
 
== Last changes ==
Line 63: Line 96:
 
</news>
 
</news>
  
== MISC ==
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== Miscellaneous ==
* Also see FAQ  -[[Frequently asked questions]].  
+
* FAQ  - [[Frequently asked questions]].  
* [[List of contributors]]
+
* [[List of wiki contributors]]
 +
* List of library contributors: [http://e6.ijs.si/medusa/about#about-contributors See the official website]
  
 
== References ==
 
== References ==
* Slak J., Kosec G.; Refined meshless local strong form solution of Cauchy-Navier equation on an irregular domain. Engineering analysis with boundary elements. 2018;11 ; [http://comms.ijs.si/~gkosec/data/papers/31107623.pdf manuscript]
+
 
* Depolli, M., Kosec, G., Assessment of differential evolution for multi-objective optimization in a natural convection problem solved by a local meshless method. Engineering optimization, 2017, vol. 49, no. 4, pp. 675-692 ;[http://comms.ijs.si/~gkosec/data/papers/29639719.pdf manuscript]
+
For all related papers including conference contributions, monographs and book chapters check https://e6.ijs.si/ParallelAndDistributedSystems/publications/
* Kosec G., A local numerical solution of a fluid-flow problem on an irregular domain. Advances in engineering software. 2016;7 ; [29512743] ; [http://comms.ijs.si/~gkosec/data/papers/29512743.pdf manuscript]
+
 
* Kosec G., Trobec R., Simulation of semiconductor devices with a local numerical approach. Engineering analysis with boundary elements. 2015;69-75; [27912487] ; [http://comms.ijs.si/~gkosec/data/papers/27912487.pdf manuscript]
+
{{Box-round|title= Selected papers |
* Kosec G., Šarler B., Simulation of macrosegregation with mesosegregates in binary metallic casts by a meshless method. Engineering analysis with boundary elements. 2014;36-44; [http://comms.ijs.si/~gkosec/data/papers/3218939.pdf manuscript]
+
 
* Kosec G., Depolli M., Rashkovska A., Trobec R., Super linear speedup in a local parallel meshless solution of thermo-fluid problem. Computers & Structures. 2014;133:30-38; [http://comms.ijs.si/~gkosec/data/papers/27339815.pdf manuscript]
+
[https://e6.ijs.si/ParallelAndDistributedSystems/publications/153678339.pdf M. Jančič, G. Kosec; Strong form mesh‑free hp‑adaptive solution of linear elasticity problem, Engineering with computers, vol. 39, 2023 [DOI: 10.1007/s00366-023-01843-6]]
* Kosec G., Zinterhof P., Local strong form meshless method on multiple Graphics Processing Units. Computer modeling in engineering & sciences. 2013;91:377-396; [http://comms.ijs.si/~gkosec/data/papers/26785063.pdf manuscript]
+
 
* Kosec G., Šarler B., H-adaptive local radial basis function collocation meshless method. Computers, materials & continua. 2011;26:227-253; [http://comms.ijs.si/~gkosec/data/papers/KosecSarlerBurgers.pdf manuscript]
+
[https://e6.ijs.si/ParallelAndDistributedSystems/publications/98533123.pdf M. Depolli, J. Slak, G. Kosec; Parallel domain discretization algorithm for RBF-FD and other meshless numerical methods for solving PDEs, Computers & Structures, 2022 [DOI: 10.1016/j.compstruc.2022.106773]]
* Trobec R., Kosec G., Šterk M., Šarler B., Comparison of local weak and strong form meshless methods for 2-D diffusion equation. Engineering analysis with boundary elements. 2012;36:310-321; [http://comms.ijs.si/~gkosec/data/papers/EABE2499.pdf manuscript]
+
 
* Kosec G, Zaloznik M, Sarler B, Combeau H. A Meshless Approach Towards Solution of Macrosegregation Phenomena. CMC: Computers, Materials, & Continua. 2011;580:1-27 [http://comms.ijs.si/~gkosec/data/papers/KosecZaloznikSarlerCombeauSegregation.pdf manuscript]
+
[https://e6.ijs.si/ParallelAndDistributedSystems/publications/69777155.pdf J. Slak, G. Kosec; Medusa : A C++ library for solving PDEs using strong form mesh-free methods, ACM transactions on mathematical software, vol. 47, 2021 [DOI: 10.1145/3450966]]
* Kosec G, Sarler B. Solution of thermo-fluid problems by collocation with local pressure correction. International Journal of Numerical Methods for Heat & Fluid Flow. 2008;18:868-82 [http://comms.ijs.si/~gkosec/data/papers/KosecSarlerNS2008.pdf manuscript]
+
 
*  Trobec R., Kosec G., Parallel Scientific Computing, ISBN: 978-3-319-17072-5 (Print) 978-3-319-17073-2.
+
[https://e6.ijs.si/ParallelAndDistributedSystems/publications/56730115.pdf U. Duh, G. Kosec, J. Slak; Fast variable density node generation on parametric surfaces with application to mesh-free methods, SIAM journal on scientific computing, vol. 43, 2021 [DOI: 10.1137/20M1325642]]
*  Slak, J., Kosec, G.. Detection of heart rate variability from a wearable differential ECG device., MIPRO 2016, 39th International Convention, 2016, Opatija, Croatia, ISSN 1847-3938, pp 450-455.
+
 
*  Kolman, M., Kosec, G. Correlation between attenuation of 20 GHz satellite communication link and liquid water content in the atmosphere. MIPRO 2016, 39th International Convention, 2016, Opatija, Croatia, ISSN 1847-3938. pp. 308-313.
+
[https://e6.ijs.si/ParallelAndDistributedSystems/publications/52715011.pdf M. Jančič, J. Slak, G. Kosec; Monomial augmentation guidelines for RBF-FD from accuracy versus computational time perspective, Journal of scientific computing, vol. 87, 2021 [DOI: 10.1007/s10915-020-01401-y]
 +
 
 +
[https://e6.ijs.si/ParallelAndDistributedSystems/publications/32782887.pdf J. Slak, G. Kosec; On generation of node distributions for meshless PDE discretizations, SIAM journal on scientific computing, vol. 41, 2019 [DOI: 10.1137/18M1231456]
 +
 
 +
[https://e6.ijs.si/ParallelAndDistributedSystems/publications/32424999.pdf G. Kosec, J. Slak, M. Depolli, R. Trobec, K. Pereira, S. Tomar, T. Jacquemin, S. Bordas, M. Wahab; Weak and strong from meshless methods for linear elastic problem under fretting contact conditions, Tribology international, vol. 138, 2019]
 +
 
 +
[https://e6.ijs.si/ParallelAndDistributedSystems/publications/32230439.pdf J. Slak, G. Kosec; Adaptive radial basis function-generated finite differences method for contact problems, International journal for numerical methods in engineering, vol. 119, 2019 [DOI: 10.1002/nme.6067]]
 +
 
 +
[https://e6.ijs.si/ParallelAndDistributedSystems/publications/32388135.pdf M. Maksić, V. Djurica, A. Souvent, J. Slak, M. Depolli, G. Kosec; Cooling of overhead power lines due to the natural convection, International journal of electrical power & energy systems, 2019]
 +
 
 +
[https://e6.ijs.si/ParallelAndDistributedSystems/publications/31107623.pdf J. Slak, G. Kosec; Refined meshless local strong form solution of Cauchy-Navier equation on an irregular domain, Engineering analysis with boundary elements, vol. 100, 2019]
 +
 
 +
[https://e6.ijs.si/ParallelAndDistributedSystems/publications/29639719.pdf M. Depolli, G. Kosec; Assessment of differential evolution for multi-objective optimization in a natural convection problem solved by a local meshless method, Engineering optimization, 2017, vol. 49, no. 4, pp. 675-692]
 +
 
 +
[https://e6.ijs.si/ParallelAndDistributedSystems/publications/29512743.pdf G. Kosec; A local numerical solution of a fluid-flow problem on an irregular domain, Advances in engineering software, vol. 120, 2018 [DOI: 10.1016/j.advengsoft.2016.05.010]]
 +
 
 +
[https://e6.ijs.si/ParallelAndDistributedSystems/publications/27912487.pdf G. Kosec, R. Trobec; Simulation of semiconductor devices with a local numerical approach, Engineering analysis with boundary elements, 2015 [DOI: 10.1016/j.enganabound.2014.07.013]]
 +
 
 +
[https://e6.ijs.si/ParallelAndDistributedSystems/publications/3218939.pdf G. Kosec, B. Šarler; Simulation of macrosegregation with mesosegregates in binary metallic casts by a meshless method, Engineering analysis with boundary elements]
 +
 
 +
[http://comms.ijs.si/~gkosec/data/papers/27339815.pdf G. Kosec, M. Depolli, A. Rashkovska, R. Trobec; Super linear speedup in a local parallel meshless solution of thermo-fluid problem, Computers & Structures, vol. 133, 2014]
 +
 
 +
[http://comms.ijs.si/~gkosec/data/papers/26785063.pdf G. Kosec, P. Zinterhof; Local strong form meshless method on multiple Graphics Processing Units, Computer modeling in engineering & sciences, vol. 91, 2013]
 +
 
 +
[https://e6.ijs.si/ParallelAndDistributedSystems/publications/2599419.pdf G. Kosec, B. Šarler; Solution of a low Prandtl number natural convection benchmark by a local meshless method, International journal of numerical methods for heat & fluid flow]
 +
 
 +
[http://comms.ijs.si/~gkosec/data/papers/EABE2499.pdf R. Trobec, G. Kosec, M. Šterk, B. Šarler; Comparison of local weak and strong form meshless methods for 2-D diffusion equation, Engineering analysis with boundary elements, vol. 36, 2012]
 +
 
 +
[https://e6.ijs.si/ParallelAndDistributedSystems/publications/1905659.pdf G. Kosec, M. Založnik, B. Šarler, H. Combeau; A meshless approach towards solution of macrosegregation phenomena, Computers, materials & continua : CMC, vol. 22, 2011 ]
 +
 
 +
[https://e6.ijs.si/ParallelAndDistributedSystems/publications/992507.pdf G. Kosec, B. Šarler; Solution of thermo-fluid problems by collocation with local pressure correction, International journal of numerical methods for heat & fluid flow, vol.18, 2008]
 +
 
 +
R. Trobec, G. Kosec; Parallel scientific computing : theory, algorithms, and applications of mesh based and meshless methods, 2015
 +
 
 +
}}
  
 
==Related pages==
 
==Related pages==
* http://www-e6.ijs.si/ParallelAndDistributedSystems/#!NumericalMethods
+
* http://e6.ijs.si/ParallelAndDistributedSystems/products/medusa/
* http://www-e6.ijs.si/ParallelAndDistributedSystems/#!utils
 
* http://www-e6.ijs.si/ParallelAndDistributedSystems/#!NUMA
 

Latest revision as of 14:55, 12 March 2024

Welcome to the Medusa wiki. To visit the main website, go to http://e6.ijs.si/medusa/.

In Parallel and Distributed Systems Laboratory we are working on a C++ library that is first and foremost focused on tools for solving Partial Differential Equations by meshless methods. The basic idea is to create generic codes for tools that are needed for solving not only PDEs but many other problems, e.g. Moving Least Squares approximation, $k$-d tree, domain generation engines, etc. We call this open source meshless project Medusa: Coordinate Free Meshless Method implementation (MM).

Technical details about code and examples can be found on our documentation page and Gitlab repository. Alt text Alt text

This wiki site is meant for more relaxed discussions about general principles, possible and already implemented applications, preliminary analyses, etc. Note, that there are many grammatical mistakes, typos, stupid sentences, etc. This wiki is meant for quick information exchange and therefore we do not invest a lot of energy into styling :).

Documentation

Building blocks

Medusa is modular coordinate-free parallel implementation of a numerical framework designed, but not limited to, for solving PDEs. In this section we present main modules of the library that can be also used as a standalone tools.

Examples

In this section we present exact examples. Each of the below solutions can be found also in in the repository under examples. More explanation about the physical background and solution procedure can be found in following sections.

Discussions / Applications

This section is meant for general discussion about the physical background of the examples, the solution procedures, various applications, etc. Note, that code snippets presented in discussion might not reflect the actual state of Medusa.

Performance analyses

Last changes

  • 16:55, 23 April 2024 :: Burgers'_equation
  • 16:24, 23 March 2024 :: Hyperviscosity
  • 14:36, 13 March 2024 :: Meshless_FDM
  • 14:55, 12 March 2024 :: Medusa
  • 15:23, 2 March 2024 :: Fluid_Mechanics


Miscellaneous

References

For all related papers including conference contributions, monographs and book chapters check https://e6.ijs.si/ParallelAndDistributedSystems/publications/

edit 

Selected papers

M. Jančič, G. Kosec; Strong form mesh‑free hp‑adaptive solution of linear elasticity problem, Engineering with computers, vol. 39, 2023 [DOI: 10.1007/s00366-023-01843-6]

M. Depolli, J. Slak, G. Kosec; Parallel domain discretization algorithm for RBF-FD and other meshless numerical methods for solving PDEs, Computers & Structures, 2022 [DOI: 10.1016/j.compstruc.2022.106773]

J. Slak, G. Kosec; Medusa : A C++ library for solving PDEs using strong form mesh-free methods, ACM transactions on mathematical software, vol. 47, 2021 [DOI: 10.1145/3450966]

U. Duh, G. Kosec, J. Slak; Fast variable density node generation on parametric surfaces with application to mesh-free methods, SIAM journal on scientific computing, vol. 43, 2021 [DOI: 10.1137/20M1325642]

M. Jančič, J. Slak, G. Kosec; Monomial augmentation guidelines for RBF-FD from accuracy versus computational time perspective, Journal of scientific computing, vol. 87, 2021 [DOI: 10.1007/s10915-020-01401-y

J. Slak, G. Kosec; On generation of node distributions for meshless PDE discretizations, SIAM journal on scientific computing, vol. 41, 2019 [DOI: 10.1137/18M1231456

G. Kosec, J. Slak, M. Depolli, R. Trobec, K. Pereira, S. Tomar, T. Jacquemin, S. Bordas, M. Wahab; Weak and strong from meshless methods for linear elastic problem under fretting contact conditions, Tribology international, vol. 138, 2019

J. Slak, G. Kosec; Adaptive radial basis function-generated finite differences method for contact problems, International journal for numerical methods in engineering, vol. 119, 2019 [DOI: 10.1002/nme.6067]

M. Maksić, V. Djurica, A. Souvent, J. Slak, M. Depolli, G. Kosec; Cooling of overhead power lines due to the natural convection, International journal of electrical power & energy systems, 2019

J. Slak, G. Kosec; Refined meshless local strong form solution of Cauchy-Navier equation on an irregular domain, Engineering analysis with boundary elements, vol. 100, 2019

M. Depolli, G. Kosec; Assessment of differential evolution for multi-objective optimization in a natural convection problem solved by a local meshless method, Engineering optimization, 2017, vol. 49, no. 4, pp. 675-692

G. Kosec; A local numerical solution of a fluid-flow problem on an irregular domain, Advances in engineering software, vol. 120, 2018 [DOI: 10.1016/j.advengsoft.2016.05.010]

G. Kosec, R. Trobec; Simulation of semiconductor devices with a local numerical approach, Engineering analysis with boundary elements, 2015 [DOI: 10.1016/j.enganabound.2014.07.013]

G. Kosec, B. Šarler; Simulation of macrosegregation with mesosegregates in binary metallic casts by a meshless method, Engineering analysis with boundary elements

G. Kosec, M. Depolli, A. Rashkovska, R. Trobec; Super linear speedup in a local parallel meshless solution of thermo-fluid problem, Computers & Structures, vol. 133, 2014

G. Kosec, P. Zinterhof; Local strong form meshless method on multiple Graphics Processing Units, Computer modeling in engineering & sciences, vol. 91, 2013

G. Kosec, B. Šarler; Solution of a low Prandtl number natural convection benchmark by a local meshless method, International journal of numerical methods for heat & fluid flow

R. Trobec, G. Kosec, M. Šterk, B. Šarler; Comparison of local weak and strong form meshless methods for 2-D diffusion equation, Engineering analysis with boundary elements, vol. 36, 2012

G. Kosec, M. Založnik, B. Šarler, H. Combeau; A meshless approach towards solution of macrosegregation phenomena, Computers, materials & continua : CMC, vol. 22, 2011

G. Kosec, B. Šarler; Solution of thermo-fluid problems by collocation with local pressure correction, International journal of numerical methods for heat & fluid flow, vol.18, 2008

R. Trobec, G. Kosec; Parallel scientific computing : theory, algorithms, and applications of mesh based and meshless methods, 2015


Related pages