Greetings,
Someone can explain to me how the "Measure of the nonlinear residual " ( third column in histor.dat file ) and "Logarithm of the residual changeis" (fourth column) are computed?
thx
Mattia
nonlinear residual definition
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David Parker
- Posts: 1696
- Joined: Tue Aug 23, 2005 2:43 pm
Re: nonlinear residual definition
Hi Mattia,
The Measure of the nonlinear residual is computed by substituting in the current solution for velocity and pressure into the Navier-Stokes equations. The non-linear residual that is reported in the histor.dat file is an average residual for the entire domain; the residual divided by the number of nodes in the mesh.
The Logarithm of the residual change is computed as 10*log10(Ri/R1), where Ri and R1 is the L^2 norm of the residual vectors at iteration i and 1 respectively for each time step.
These values are computed in subroutine rstatic() in here https://github.com/SimVascular/svSolver ... routines.f
Cheers,
Dave
The Measure of the nonlinear residual is computed by substituting in the current solution for velocity and pressure into the Navier-Stokes equations. The non-linear residual that is reported in the histor.dat file is an average residual for the entire domain; the residual divided by the number of nodes in the mesh.
The Logarithm of the residual change is computed as 10*log10(Ri/R1), where Ri and R1 is the L^2 norm of the residual vectors at iteration i and 1 respectively for each time step.
These values are computed in subroutine rstatic() in here https://github.com/SimVascular/svSolver ... routines.f
Cheers,
Dave
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Mattia Zanchi
- Posts: 12
- Joined: Fri Jul 23, 2021 6:32 am
Re: nonlinear residual definition
Hi Dave,
Thank you
Mattia
Thank you
Mattia