Negative cell volume problem
 

I'm doing a dynamic mesh simulation with in-cylinder combustion. My mesh is OK when imported into fluent. However, I got this error after several itterations:
Updating mesh to time 4.00000e-04 (step = 00045) (crank-angle = 184.80)...
Warning: non-positive volumes exist.

Error: Update-Dynamic-Mesh failed. Negative cell volume detected.
Error Object: #f
How can I fix this?

i have the same problem
the negative cell volume exists when i preview the apdating the mesh
have you found the problem

negative volume
 

Hi schuny and roukaia

Please follow the strategy given in the tutorial on piston displacement because for such problem there should not be any problem.

Regards
mvee

thank you for replying

do you mean the tutoriel of dynamic mesh (smoothing layering )

regards

-ve volume
 

You can solve any problem based on smoothing and remeshing.

GAMBIT :structured & unstructured mesh in one face
 

dear mvee
yes i agree with you but i have also the layering method wich need a structured mesh (the layering zones valves must be in quadr)
there is a joint piece for more details Attachment 9871
please have you got any idea about how to construct (a structured & unstructured mesh in one face in gambit because i think that 's the main problem of negative volume

any will be appreciated

more details about my mesh and even the error in the joint piece

Updating mesh to time 3.88889e-04 (step = 00007) (crank-angle = 363.50)...
Warning: negative volume detected --> repeat smoothing!
Warning: negative volume detected --> repeat smoothing!
Warning: negative volume detected --> repeat smoothing!
Warning: non-positive volumes exist.

Error: Update-Dynamic-Mesh failed. Negative cell volume detected.
Error Object: #f

need help for meshing in gambit
 

more details about my mesh in the joint piece

Updating mesh to time 3.88889e-04 (step = 00007) (crank-angle = 363.50)...
Warning: negative volume detected --> repeat smoothing!
Warning: negative volume detected --> repeat smoothing!
Warning: negative volume detected --> repeat smoothing!
Warning: non-positive volumes exist.

Error: Update-Dynamic-Mesh failed. Negative cell volume detected.
Error Object: #f

solution
 

Hi

Did you solve the issue? Pl update me.

Regards
mvee