Hi again, is there a way to implement periodic boundry conditions in fipy?
for instance: field(x=L)==field(x=-L) Thanks Francisco El mar, 17-05-2016 a las 09:44 -0400, Daniel Wheeler escribió: > Hi Francisco, > > In FiPy, it is necessary to add both a TransientTerm and a source term > for terms such as, > > density (times) (\partial f[x]/\partial t) > > So, the code will look something like this, > > TransientTerm(var=var, coeff=density) - field * (density - density.old) / > dt > > There may be ways to improve the convergence with implicit sources, > but I haven't investigated that. For example, the "field * density.old > / dt" part could become implicit in "field" and the the "field * > density / dt" could be implicit for "density" and coupled with an > equation solving for density. > > Cheers, > > Daniel > > On Mon, May 16, 2016 at 1:30 PM, Francisco Vega Reyes <fv...@unex.es> wrote: > > Hello, > > > > a very common term in the Navier-Stokes equations for a gas is of the form: > > > > density (times) (\partial f[x]/\partial t), > > > > where f[x] is a hydrodynamic field (for instance, temperature). however, it > > appears in the Fipy manual that the transient terms that express time > > derivatives have no multiplying coefficients. I’d like to solve the > > transient Navier Stokes equations for a gas without having to divide the > > whole balance equations by density, which is of course also an unknown. > > > > How can I express then a term of the form above in Fipy? > > > > Thank you very much, > > > > > > Dr. Francisco Vega Reyes > > > > Departamento de Física, > > Universidad de Extremadura, > > 06071 Badajoz, Spain > > > > fv...@unex.es > > > > > > > > > > > > _______________________________________________ > > fipy mailing list > > fipy@nist.gov > > http://www.ctcms.nist.gov/fipy > > [ NIST internal ONLY: https://email.nist.gov/mailman/listinfo/fipy ] > > > _______________________________________________ fipy mailing list fipy@nist.gov http://www.ctcms.nist.gov/fipy [ NIST internal ONLY: https://email.nist.gov/mailman/listinfo/fipy ]
