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time varying boundary conditions for advection diffusion equation problems copied.
time varying boundary conditions for advection diffusion equation problems
last edited 4 years ago by Alice
Hi there, the CMISS quirk I found is that the function IPINIT asks you for specifying a file called xy.ipinit_time if one wants to define time-dependent boundary consditions. However, nothing happens because the option is only used for explicit/implicit finite difference problems. This is employed by function march4, but not by march1 (march1 refers to parabolic equations like the advection/diffusion equation). The current workaround is a Perl script that updates the xy.ipinit file looping around the fem define initial command over N time steps. Here's attached a simplified pseudo code example listing the important commands.