plz give me tips that why grid check is failed when fluent run the mesh file.grid is seemed to be accurate but fluent give error.also i have checked the grid in Gambit no error exist.plz inform me ,i will be very thankful to u

Check for negative volume. there could be some left handed faces. All cell faces should be right handed. you can make them correct in gambit or gridgen whichever u r using.

plz chk ur jacobian, or make sure that u r not using point connectors