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hi, i made a model using BLUEKENUE , but when i run the simulation it gave me the error "NEGATIVE DETERMINANT". i read in the forum that the cause of such error is i missed used the channel mesher.

i already tried a lot of number of point vs length in the channel mesher but it just wont work. i already tried to edit- T3mesher -etc.... al the options to correct the mesh grid. so can somebody take a look to my mesh for me?


textual error:

" INBIEF (BIEF): NOT A VECTOR MACHINE (ACCORDING TO YOUR DATA)
GEOELT: ELEMENT 10652 : NEGATIVE DETERMINANT

PLANTE: PROGRAM STOPPED AFTER AN ERROR
RETURNING EXIT CODE: 2
"


thank you for your time.

Chelo.

Hi

This problems often occur at the junction between the channel mesh and the triangular mesh.
Nevertheless, in you case it seems there is also other problems which let me say you should work on your mesh before trying to run a computation.
If you look on the mesh analysis results, you will find very small edge length which could create problems and I also notice that your boundary is very irregular...
There is also an island in your mesh, at the end of the channel mesh. Is it normal?
So you have to clean you mesh first and then you could start to run another simulation

Regards

thank you for responding.
yes the island its supposed to be there, im trying to simulate the entry of the river in to a sewer system , but i don’t know if it is the best way to do so. is there any other way to simulate a close channel in the same file as a open river?

i will try to get rid of the edges you talk about. any suggestions on the relations between the numbers of nodes in the channel mesh and the length of the sides of the channel mesh?


kind regards,

chelo.