On 7/9/25 23:40, Md Mahmudul Islam wrote:
Hope this email finds you all well. I am working on NSE flow. I wrote my code
in parallel following step-55. I could compile the code, but when I run the
code I get this following error of ghost elements:
An error occurred in line <941> of file
</usr/src/dealii-v9.6.0/include/deal.II/lac/petsc_vector_base.h> in function
const dealii::PETScWrappers::internal::VectorReference&
dealii::PETScWrappers::internal::VectorReference::operator+=(const
PetscScalar&) const
The violated condition was:
!vector.has_ghost_elements()
Additional information:
You are trying an operation on a vector that is only allowed if the
vector has no ghost elements, but the vector you are operating on does
have ghost elements.
Specifically, there are two kinds of operations that are typically not
allowed on vectors with ghost elements. First, vectors with ghost
elements are read-only and cannot appear in operations that write into
these vectors. Second, reduction operations (such as computing the
norm of a vector, or taking dot products between vectors) are not
allowed to ensure that each vector element is counted only once (as
opposed to once for the owner of the element plus once for each
process on which the element is stored as a ghost copy).
I think that the error message is actually quite clear. It explains what the
problem is, and at the top it also says which function causes trouble. Which
part is not clear to you, and what stops you from fixing the issue yourself?
Best
W.
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