:orphan:
# PetscFVRefine
Create a "refined" `PetscFV` object that refines the reference cell into smaller copies. This is typically used to precondition a higher order method with a lower order method on a refined mesh having the same number of dofs (but more sparsity). It is also used to create an interpolation between regularly refined meshes. 
## Synopsis
```
#include "petscfv.h" 
PetscErrorCode PetscFVRefine(PetscFV fv, PetscFV *fvRef)
```

## Input Parameter

- ***fv -*** The initial `PetscFV`



## Output Parameter

- ***fvRef -*** The refined `PetscFV`





## See Also
 `PetscFV`, `PetscFVType`, `PetscFVCreate()`, `PetscFVSetType()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/dt/fv/interface/fv.c.html#PetscFVRefine">src/dm/dt/fv/interface/fv.c</A>


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[Index of all FV routines](index.md)  
[Table of Contents for all manual pages](/manualpages/index.md)  
[Index of all manual pages](/manualpages/singleindex.md)