[deal.II] step 70 9.2 version

[heena patel]

Dear all,
 
I had downloaded latest 9.2 version and had run 
some tutorials successfully. When I try to run tutorial 70 it gives 
following error. Kindly help me.


TimerOutput objects finalize timed values printed to the
screen by communicating over MPI in their destructors.
Since an exception is currently uncaught, this
synchronization (and subsequent output) will be skipped
to avoid a possible deadlock.
-



Exception on processing: 


An error occurred in line <1360> of file 
 in 
function
void dealii::ParameterHandler::print_parameters(const string&, 
dealii::ParameterHandler::OutputStyle) const
The violated condition was: 
out
Additional information: 
An input/output error has occurred. There are a number of reasons why 
this may be happening, both for reading and writing operations.

If this happens during an operation that tries to read data: First, you may 
be trying to read from a file that doesn't exist or that is not readable 
given its file permissions. Second, deal.II uses this error at times if it 
tries to read information from a file but where the information in the file 
does not correspond to the expected format. An example would be a truncated 
file, or a mesh file that contains not only sections that describe the 
vertices and cells, but also sections for additional data that deal.II does 
not understand.

If this happens during an operation that tries to write data: you may be 
trying to write to a file to which file or directory permissions do not 
allow you to write. A typical example is where you specify an output file 
in a directory that does not exist.



Regards,
Heena

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[deal.II] How to get normal / tangential vectors at nodes, not at quadrature points?

[Lex Lee]

Hello Deal.II Users,


I am working on setting a constraint: (V - v_s ) \cdot n =  \phi_f (v_f - 
v_s) \cdot n  on three vector variables at the interface with affine 
constraint class in Deal.II's library.

(Where, V, v_s, and v_f are velocity vectors on two different domains,  and 
they are coupled with each other at the interface; n is the normal vector; 
\phi_f is the volume fraction.)


I decided to constrain either V_x= -(...) / n_x  or  V_y= -(...) / n_y 
depending on the absolute values of n_x or n_y (n_x and n_y are the 
components at x, y directions of the normal vector n).

Now, I have a problem with getting the normal vectors *at nodes *when 
playing with affine constraint within the fe_nothing and hp:finite element 
framework. The relevant function/class I have found in Deal.II's library 
all return the normal vector *at quadrature points,* not at nodes.

Have you ever encountered a problem like this? Could you kindly share me 
your idea of handling this problem? Thousand of thanks. 


Best,

Lei Li


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