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[ESPResSo-devel] error in dawaanr interaction

From: Markus Gusenbauer
Subject: [ESPResSo-devel] error in dawaanr interaction
Date: Fri, 26 Sep 2014 10:30:11 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0


I am wondering if the equation for the dawaanr (dipole-dipole) interaction implemented in ESPResSo is correct (magnetic_non_p3m_methods.c).

According to the following papers the force equation in the code is missing the term µ0/(4 pi):

E. P. Furlani, Permanent magnet and electromechanical devices: materials, analysis, and applications, Academic Press, 2001.

S. Melle, O. G. Calder ́n, M. A. Rubio, G. G. Fuller, Microstructure evolution in magnetorheological suspensions governed by
mason number, Physical Review E 68 (4) (2003) 041503.

S. Krishnamurthy, A. Yadav, P. E. Phelan, R. Calhoun, A. K.Vuppu, A. A. Garcia, M. A. Hayes, Dynamics of rotating paramagnetic particle chains simulated by particle dynamics, stokesian dynamics and lattice boltzmann methods, Microfluidics and Nanofluidics 5 (1) (2007) 33–41.

As µ0 = 4 pi 10⁻⁷ we can cancel 4 pi, but still 10⁻⁷ is absent. Maybe I miss something important. Can anyone clarify this issue? Thanks!


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