Hi All Does anyone know how to implement the Particle tracing either Mathematical Particle tracing or ACDC Particle Tracing. I want to know how to define the below force equation : How do I make COMSOL understand this equation in terms of first derivative, second derivative like f(u,ut,utt,t ) ??? [image: F_\mathrm{DEP} = \frac{\pi r^2 l}{3}\varepsilon_m \textrm{Re}\left\{\frac{\varepsilon^*_p - \varepsilon^*_m}{\varepsilon^*_m}\right\}\nabla \left|\vec{E}\right|^2] Best regards -- *Deepan Kishore Kumar* -------------------------------------------------------------------------------- ----------------------------------------------------------- B.E.(Hons.) Electronics & Communication | BITS Pilani - Dubai Campus Dubai International Academic City +971.559.95.4960 United Arab Emirates -------------------------------------------------------------------------------- ----------------------------------------------------------- _______________________________________________ Hosted by the MEMS and Nanotechnology Exchange, the country's leading provider of MEMS and Nanotechnology design and fabrication services. Visit us at http://www.mems-exchange.org Want to advertise to this community? See http://www.memsnet.org To unsubscribe: http://mail.mems-exchange.org/mailman/listinfo/mems-talk