How to setup a 2D simulation in CFX

winchler · October 17, 2017, 11:03

Hi to all,
I read all the documentation I've found on this forum about this much discussed topic, but I don't found the right answer.

I need to run a CFX simulation of an axisymmetric 2D geometry, with a swirling flow inlet.
I don't know how to prepare the geometry, since the documentation (https://www.cfd-online.com/Wiki/Ansy...tion_in_CFX.3F) told me that I have to prepare the 2D mesh (I prepared it Using Ansys Meshing) and after that I have to "sweep a small angle with one element".
I don't know how to do that in Ansys Meshing, since "sweep" method is only available in 3D bodies, and that means that I have to produce a 3D geometry, differently from what i found on the FAQ.

Linking the 2D mesh in CFX produce an error (because a volume is not present).

Can please someone help me? Thak you

TimH · October 28, 2017, 18:56

Hey

You nees to prepare the geometry so that it has the angle that you want. But cfx does not have axisymmetric solver like fluent, so in fluent you would only need one element, but in cfx you actually need a “cake peace” and define a rotational periodicity on these using interfaces.

BR,
Tim

October 17, 2017, 11:03	How to setup a 2D simulation in CFX	#1
winchler New Member Join Date: Oct 2017 Posts: 4 Rep Power: 9	Hi to all, I read all the documentation I've found on this forum about this much discussed topic, but I don't found the right answer. I need to run a CFX simulation of an axisymmetric 2D geometry, with a swirling flow inlet. I don't know how to prepare the geometry, since the documentation (https://www.cfd-online.com/Wiki/Ansy...tion_in_CFX.3F) told me that I have to prepare the 2D mesh (I prepared it Using Ansys Meshing) and after that I have to "sweep a small angle with one element". I don't know how to do that in Ansys Meshing, since "sweep" method is only available in 3D bodies, and that means that I have to produce a 3D geometry, differently from what i found on the FAQ. Linking the 2D mesh in CFX produce an error (because a volume is not present). Can please someone help me? Thak you

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October 28, 2017, 18:56		#2
TimH New Member Join Date: Apr 2016 Posts: 13 Rep Power: 10	Hey You nees to prepare the geometry so that it has the angle that you want. But cfx does not have axisymmetric solver like fluent, so in fluent you would only need one element, but in cfx you actually need a “cake peace” and define a rotational periodicity on these using interfaces. BR, Tim