Export

{ EXPORT.PDE }

{ *******************************************************************

   This sample demonstrates the use of EXPORT selectors in PLOT output.

   ******************************************************************* }

title "Demonstrate forms of export"

select

    contourgrid=50

Variables

    Temp                     { Identify "Temp" as the system variable }

definitions

    K = 1                             { declare and define the conductivity }

    source = 4                        { declare and define the source }

    Texact = 1-x**2-y**2    { for convenience, define the exact solution }

    flux=magnitude(K*grad(Temp))

Initial values

    Temp = 0                          { unimportant in linear steady-state problems }

equations

    div(K*grad(Temp)) + source = 0   { define the heatflow equation }

boundaries                           { define the problem domain }

    Region 1                          { ... only one region }

       start "BDRY" (-1,-1)    { specify the starting point }

       value(Temp)=Texact      { specify Dirichlet boundary at exact solution }

       line to (1,-1)                 { walk the boundary }

            to (1,1)

            to (-1,1)

            to close                    { bring boundary back to starting point }

monitors

    contour(Temp)             { show the Temperature during solution }

plots                                { write these hardcopy files at completion }

    contour(Temp)

    cdf(temp,flux)

    table(temp)

    tecplot(temp,flux)

end