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April 18, 2012, 03:54 |
select specific region of mesh in CFX
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#1 |
New Member
Join Date: Apr 2012
Posts: 7
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Hi to everyone, I am a new user of ANSYS CFX,
I want to select specific region of mesh and fill this region with specific values of pressure and temperature as initials values, how can I do this in CFX? Any ideas welcome |
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April 18, 2012, 04:39 |
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#2 |
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Raja_Bhai
Join Date: Feb 2012
Location: UK
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April 18, 2012, 05:11 |
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#3 |
Senior Member
Lance
Join Date: Mar 2009
Posts: 669
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That link refers to an old manual. Instead, see the pdfs that come with the installation (or the built in help).
Read the tutorials in cfx_tutr.pdf. You'll find them at: <installation root>\ANSYS Inc\v140\commonfiles\help\en-us\pdf\ |
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April 18, 2012, 06:49 |
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#4 |
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My prbolem is NOT inspecting boundary conditions! I want to choose a certain zone of mesh(for example a circular zone) and assign certain pressure and temperature in that zone and initialize problem.
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April 18, 2012, 06:49 |
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#5 |
New Member
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My problem in NOT specifying boundary conditions! I want to choose a certain zone of mesh(for example a circular zone) and assign certain pressure and temperature in that zone and initialize problem.
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April 18, 2012, 08:13 |
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#6 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
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Use a CEL expression to define the region, eg a = step(((1[m]-abs(x))/1[m]) selects a strip -1>x>1 to have a=1, elsewhere a=0. You can use this to define initial conditions and boundary conditions.
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April 18, 2012, 09:04 |
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#7 | |
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Oleg
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Quote:
Regards, Oleg |
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April 18, 2012, 09:07 |
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#8 |
Super Moderator
Glenn Horrocks
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You have access to all the volume and faces defined in the mesh file if you look in the feature tree. But if the volume or face you want is not defined int he mesh file youhave to either remesh to include it or define it another way such as using CEL.
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April 18, 2012, 09:18 |
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#9 |
New Member
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Dear glen,thank you for your perfect answer, but I have another question,what is the mean of "step()",I couldn't find it in CFX help
Last edited by payam.t; April 18, 2012 at 09:55. |
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April 19, 2012, 09:49 |
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#10 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,665
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step() is in the CFX reference manual. It returns 0 if the argument is negative, 0.5 if zero and 1 if positive.
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April 20, 2012, 05:31 |
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#11 |
New Member
lihui
Join Date: Jun 2010
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But you must know a point,a bout step() function, step() just back to three value,0,1,0.5,but about the step(x),this x, you must know this value not real value,just floating point.If the floating point locate nearby the value zero, and want to use the step()function, must use interpolation method to sovle it.
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