Negative cells in AutoGrid

funmaker · September 7, 2011, 11:10

Hello everybody,

i have created a wind turbine geometry in IGG and try to generated a mesh in AutoGrid using the wind turbine wizzard. Everything is working fine. I import and link the geometry in AutoGrid by defining a suction and pressure side, leading and trailing edge and also shroud and hub.
In the B2B view i got sharp edges on the leading and trailing edge position because opened airfoil profiles. To get rounded edges i use the option blend the blade at leading/trailing edge. All this works great.
But by generating the 3D mesh for the blade and far field i get negative cells.
Thy reach from the center of blade tip into the far field.

Maybe one of you could give me and advice.
Kind regards Matthew

totti9090212 · September 17, 2011, 11:15

Hi, i think your geometry( bad geometry ) and poor gird distributed may lead negtive cells. see the b2b view of the position which have negtive cells. from it , you could find which cause negtive cells. if your geometry is good, you can adjust the gird points, cell width and expansion ratio to improve your grid quality.

September 7, 2011, 11:10	Negative cells in AutoGrid	#1
funmaker New Member Matthias Join Date: Sep 2011 Posts: 2 Rep Power: 0	Hello everybody, i have created a wind turbine geometry in IGG and try to generated a mesh in AutoGrid using the wind turbine wizzard. Everything is working fine. I import and link the geometry in AutoGrid by defining a suction and pressure side, leading and trailing edge and also shroud and hub. In the B2B view i got sharp edges on the leading and trailing edge position because opened airfoil profiles. To get rounded edges i use the option blend the blade at leading/trailing edge. All this works great. But by generating the 3D mesh for the blade and far field i get negative cells. Thy reach from the center of blade tip into the far field. Maybe one of you could give me and advice. Kind regards Matthew

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September 17, 2011, 11:15		#2
totti9090212 New Member totti Join Date: Feb 2010 Posts: 3 Rep Power: 4	Hi, i think your geometry( bad geometry ) and poor gird distributed may lead negtive cells. see the b2b view of the position which have negtive cells. from it , you could find which cause negtive cells. if your geometry is good, you can adjust the gird points, cell width and expansion ratio to improve your grid quality.