[petsc-users] Re-zero sparse matrix and MatZeroEntries

[TAY wee-beng]

Hi,

I am trying to solve the Navier Stokes momentum equation of a moving body.

For most points (a), I will be using the north/south/east/west locations 
to form the equation.

However, for some points (b), due to the moving body, I will be using 
some interpolation schemes. At different time step, the interpolation 
template will be different for these points. Hence, I will use different 
neighboring points to form the equation.

Moreover, points (a) can change to points (b) and vice versa.

I wonder if I can use MatZeroEntries to re-zero the whole sparse matrix. 
But in the manual, it states that "For sparse matrices this routine 
retains the old nonzero structure. ". However for my case, the template 
is different at different time step.

Hence what is the most efficient procedure?

-- 
Yours sincerely,

TAY wee-beng