#### Alexander Wagner

#### Associate Professor

Physics Seminar Organizer

Ph.D., Theoretical Physics, Oxford University, 1997

M.S., Physics, University of Bielefeld, 1994

Vordiplom, Physics and Mathematics, University of Bielefeld, 1990

Department of Physics

South Engineering 210

North Dakota State University

Fargo, ND 58108

Tel: (701) 231-9582 or 231-8974

Fax: (701) 231-7088

alexander.wagner [at] ndsu [dot] edu

### DSFD

I am the chair of the scientific organizing committee for the annual International Conference on Discrete Simulation of Fluid Dynamics . The first meeting of this conference was in 1987 and this conference has seen the birth of several new important computational methods. The most notable of these are lattice Gases, lattice Boltzmann, Dissipative Particle Dynamics, and Stochastic Rotation Dynamics. At this conference you will find announcements of new developments in these methods and their application to a variety of fields including Soft Matter Physics, Chemical Engineering, Biological Application, and Engineering Fluid Dynamics. For information on the current conference visit dsfd.org. If you want to receive general announcements about the dsfd conference as well as job announcements for doctoral, postdoctoral, faculty or industrial opportunities you can add your email address to our mailinglist here.

### PRE

I am the Associate Editor of the Computational Physics section for Physical Review E.

pre.aps.org/staff

#### Teaching

Fall 2008: Quantum Physics, PHYS 771

Spring 2009: Statistical Mechanics PHYS 462/662

#### Research Interest

Lattice Boltzmann

Spinodal Decomposition

Viscoelasticity

Drop Deformation and Break-up in a Shear Flow

Wetting (with Andrew Briant)

Non-equilibrium Thermodynamics

Complex systems

#### Open Source Software

You can find several research codes in this section. They are currently mostly aimed at Students and collaborators. Other people may find the documentation somewhat scarce, but you are still welcome to download the codes.

### Graphical User Interface for scientific application

I (together with Johannes Schlosser) have been developing a GUI for scientists. This library is available as open source software under the GNU public license. It is a C-library that requires the X-windows libraries, *i.e.* it is useful for people writing C programs under UNIX (or Linux). You can find a description of and download information for the library at http://physics.ndsu.edu/people/faculty/wagner/graphics_library/.

### Example Lattice Boltzmann Codes

If you have any suggestions for improvements in these codes (because you found a bug, you know how to improve the performance or because you have some suggestion on making them more readable) please send me an e-mail with your suggestions.

#### Publications

Theses

Physik Diplom (Bielefeld): Chaos in far intrinsic semiconductors (August 1994).

D. Phil. in Theoretical Physics (Christ Church, Oxford): Theory and application of the lattice Boltzmann method (December 1997).

Journal Publications

36. | Joseph B. Miller, Austin C. P. Usselman, Rebecca J. Anthony, Uwe R. Kortshagen, Alexander J. Wagner, Alan R. Denton and Erik K. Hobbie, "Phase separation and the 'coffee-ring' effect in polymerâ€“nanocrystal mixtures",Soft Matter 10, 1665-1675 (2014). | |

35. | G. Kaehler, A.J. Wagner, "Fluctuating ideal-gas lattice Boltzmann method with fluctuation dissipation theorem for nonvanishing velocities", Phys. Rev. E 87, 063310 (2013). | |

34. | A.J. Wagner, "Derivation of a non-objective Oldroyd model from the Boltzmann equation'', cond-mat/0105067 | |

33. | E. M. Foard and A. J. Wagner, "Survey of morphologies formed in the wake of an enslaved phase-separation front in two dimensions", Phys. Rev. E 85, 011501 (2012), arXiv:1103.5496. | |

32. | G. Kaehler, and A. Wagner, "Cross Correlators in Fluctuating Ideal Gas Lattice Boltzmann Simulations", Commun. Comput. Phys., 9 (2011), pp. 1315-1322. | |

31. | E.M. Foard and A.J. Wagner, "Enslaved Phase-Separation Fronts and Liesegang Pattern Formation",Commun. Comput. Phys., 9 (2011), pp. 1081-1093 | |

30. | E. Foard and A.J. Wagner, "Enslaved Phase-Separation Fronts in One-Dimensional Binary Mixtures",Phys Rev. E 79, 056710 (2009) arXiv/0805.3745 | |

29. | A.J. Wagner and C.M. Pooley, "Interface width and bulk stability: Requirements for the simulation of deeply quenched liquid-gas systems", Phys. Rev. E 76, 045702(R) (2007), arXiv/0706.1386 | |

28. | Qun Li and A.J. Wagner, "A Symmetric Free Energy Based Multi-Component Lattice Boltzmann Method", Phys. Rev. E 76, 036701 (2007), arXiv:0704.3444. | |

27. | A.J. Wagner, S. May, "Electrostatic interactions across a charged lipid bilayer", European Biophysical Journal 36, 293 (2007), cond-mat/0607733. | |

26. | A.J. Wagner, "Thermodynamic consistency of liquid-gas lattice Boltzmann simulations", Phys. Rev. E 74, 056703 (2006), cond-mat/0607087. | |

25. | A.J. Wagner and Q. Li, "Investigation of Galilean Invariance of multi-phase lattice Boltzmann methods", Physica A 362, 105 (2006). cond-mat/0410555. | |

24. | M.E. Cates, J.-C. Desplat, P. Stansell, A.J. Wagner, K. Stratford, R. Adhikari, I. Pagonobarraga, "Physical and computational scaling issues in lattice Boltzmann simulations of binary fluid mixtures", Phil. Trans.: Math., Phys. and Eng. Sci. A 363, 1917 (2005), cond-mat/0411490. | |

23. | R. Adhikari, M. E. Cates, K. Stratford, A. Wagner, ``Fluctuating lattice Boltzmann'', Europhys. Lett. 71, 473 (2005). cond-mat/0402598. | |

22. | A. Akthakul, A.J. Wagner, C.E. Scott and A.M. Mayes, "Lattice Boltzmann Simulation of Asymmetric Membrane Formation by Immersion Precipitation", Journal of Membrane Science 249, 213 (2005). | |

21. | M.E. Cates, K. Stratford, R. Adhikari, P. Stansell, J-C. Desplat, I. Pagonabarraga and A.J. Wagner, "Simulating colloid hydrodynamics with lattice Boltzmann methods", J. Phys.: Condens. Matter 16 S3903 (2004). [also cond-mat/0404643. | |

20. | A.J. Briant, A.J. Wagner and J.M. Yeomans, "Lattice Boltzmann simulations of contact line motion. I. Liquid-gas systems'', Phys. Rev. E 69, 031602 (2004). | |

19. | A.J. Wagner, "Simulations of a rising drop in a non-linear viscoelastic fluid", , Progress in Computational Fluid Dynamics 5, 20 (2005). | |

18. | A.J. Wagner, L.M. Wilson and M.E. Cates, "Role of inertia in two-dimensional deformation and breakup of a droplet", Phys. Rev. E 68, 045301(R) (2003).[also cond-mat/0212540] | |

17. | M. E. Cates, J. Vollmer, A. Wagner and D. Vollmer, "Phase Separation in Binary Fluid Mixtures with Continuously Ramped Temperature", Phil. Trans. Roy. Soc. (Lond.) Ser. A, 361 793 (2003).[also cond-mat/0304085 ] | |

16. | A.J. Wagner, "The origin of spurious velocities in lattice Boltzmann", Int. J. Mod. Phys. B 17 193 (2003).[also cond-mat/0207558] | |

15. | D. Vollmer, J. Vollmer and A.J. Wagner, "Oscillatory kinetics of phase separation in a binary mixture induced by constant heating'', Phys.Chem. Chem. Phys. 4, 1380 (2002). | |

14. | A.J. Wagner, "Non-uniqueness of late-time scaling states in spinodal decomposition'', InterJournal Complex Systems Manuscript Number: [404], [also cond-mat/0005511]. | |

13. | A.J. Wagner and Ignacio Pagonabarraga, "Lees-Edwards boundary conditions for lattice Boltzmann", J. Stat. Phys. 107, 521 (2002), [also cond-mat/0103218]. | |

12. | Ignacio Pagonabarraga, A.J. Wagner and M.E. Cates, "Binary fluid demixing: The crossover region", J. Stat. Phys. 107, 39 (2002), [also cond-mat/0103269]. | |

11. | A.J. Wagner and M. E. Cates, "Phase ordering of two-dimensional symmetric binary fluids: a droplet scaling state", Europhys. Lett. 56, 556 (2001), [also cond-mat/0101140]. | |

10. | B.M. Boghosian, J. Yepez, P.V. Coveney and A.J. Wagner, "Entropic lattice Boltzmann methods", Proc. of the Royal Soc. London A Mat., 457, 717 (2001) [also cond-mat/0005260.] | |

9. | J.-C. Desplat, A.J. Wagner, and M.E. Cates, "Interfacial dynamics in 3D binary fluid demixing: Animation studies'', I. Pagonabarraga, New Journal of Physics 3 9, (2001). | |

8. | J.M. Yeomans and A.J. Wagner, "Lattice Boltzmann simulations of complex fluids'', IMA Journal of Mathematics Applied in Business and Industry, 11, 257 (2000). | |

7. | A.J. Wagner, L. Giraud, and C.E. Scott, "Simulation of a cusped bubble rising in a viscoelastic fluid with a new numerical method'', Comp. Phys. Comm. 129 227 (2000) [also cond-mat/9904029]. | |

6. | A.J. Wagner and J.M. Yeomans, "Spinodal decomposition of binary mixtures under shear'', Phys. Rev. E 59, 4366 (1999) [also cond-mat/9904033]. | |

5. | A.J. Wagner and J.M. Yeomans, ``Spinodal decomposition in two-dimensional binary fluids'', Int. Jour. Mod. Phys. C. 9, 1373 (1998). | |

4. | A.J. Wagner, "An H-Theorem for Lattice Boltzmann'', Europhys. Lett. 44, 144 (1998) [also cond-mat/9808052]. | |

3. | A.J. Wagner and J.M. Yeomans, "Breakdown of scale invariance in the coarsening of phase-separating binary fluids'', Phys. Rev. Lett. 80, 1429 (1998) [also cond-mat/9710039]. | |

2. | A.J. Wagner and J.M. Yeomans, "Effect of shear on droplets in a binary mixture'', Int. Jour. Mod. Phys. C. 8, 773 (1997) [also cond-mat/970813]. | |

1. | A.J. Wagner, "Chaos in Semiconductors induced by a magnetic field'', Proceedings of the International Conference on Dynamical Systems and Chaos, Vol.2, p. 246, Singapore World Scientific (1995). |