2D vawt simulation meshing and fluent error

daysley · March 27, 2013, 08:19

Hi

i've been carrying out simulations on a 2d darrieus vawt, some of which have been successful. recently i've been trying to recreate the problem at home but i am faced with different errors or results. for example i have defined and meshed the rectangular domain containing a circular domain containing the turbine rotates. after naming selections of the geometry i start fluent and try to configure a sliding mesh interface. however fluent changes what surfaces and zones appear (sometimes i have two surface zones for the rectangle and circle other times i just get surface_body). Then when trying to create the interface between the edge of the circular domain the circle area i am told it cant intersect the threads and there is a non-conformal interface error? I cant understand what i am doing wrong as i have had the simulation running previously with the same conditions and interfaces. any help would be great, feel free to ask for any more information as i'm not sure what to include.

thanks in advance

oj.bulmer · March 27, 2013, 10:08

A silly suggestion, try changing the word "surface" in your boundary conditions to something like "surf". I have faced problems in Fluent when I used names like "fluid_interface" , "inlet_pressure_plane" etc. FLUENT grabs those words and assigns the relevant boundary conditions, though you don't want it to. May or may not work though.

OJ

daysley · March 27, 2013, 10:49

no everything is a big help so ill give that try and see how i get on thanks!

oj.bulmer · April 4, 2013, 10:07

daysley, I am just curious, was the use of word "surface" a problem? Could you solve it?

OJ

daysley · April 4, 2013, 17:43

OJ, it did work yes thanks for the help. As soon as I renamed them without including "surface zone", fluent identified them as different surface zones and allowed the interface to work correctly

shafqat · April 15, 2014, 19:51

hi dasley,whenever i go to setup and go to boundary condition then there is no option of circle surface for sliding meshing?and when i try using wall surface body as a interface instead of circle surface then there comes a error there is no periodic zones touching the interface?whats the problem?at which part i m doing wrong?thank in advance?and one more thing when i saw your above images then why in your geometery line bodies are still present?i mean should not be they subtracted?and surface body should be three one for rectangle and two for circles?

March 27, 2013, 10:08		#2
oj.bulmer Senior Member OJ Join Date: Apr 2012 Location: United Kindom Posts: 473 Rep Power: 20	A silly suggestion, try changing the word "surface" in your boundary conditions to something like "surf". I have faced problems in Fluent when I used names like "fluid_interface" , "inlet_pressure_plane" etc. FLUENT grabs those words and assigns the relevant boundary conditions, though you don't want it to. May or may not work though. OJ daysley likes this.

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March 27, 2013, 10:49		#3
daysley New Member sam daysley Join Date: Feb 2013 Posts: 28 Rep Power: 13	no everything is a big help so ill give that try and see how i get on thanks!

April 4, 2013, 10:07		#4
oj.bulmer Senior Member OJ Join Date: Apr 2012 Location: United Kindom Posts: 473 Rep Power: 20	daysley, I am just curious, was the use of word "surface" a problem? Could you solve it? OJ

April 4, 2013, 17:43		#5
daysley New Member sam daysley Join Date: Feb 2013 Posts: 28 Rep Power: 13	OJ, it did work yes thanks for the help. As soon as I renamed them without including "surface zone", fluent identified them as different surface zones and allowed the interface to work correctly

April 15, 2014, 19:51		#6
shafqat New Member shafqat Join Date: Apr 2014 Posts: 8 Rep Power: 12	hi dasley,whenever i go to setup and go to boundary condition then there is no option of circle surface for sliding meshing?and when i try using wall surface body as a interface instead of circle surface then there comes a error there is no periodic zones touching the interface?whats the problem?at which part i m doing wrong?thank in advance?and one more thing when i saw your above images then why in your geometery line bodies are still present?i mean should not be they subtracted?and surface body should be three one for rectangle and two for circles?