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DFBI Superposed rotation inside overset mesh. |
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August 28, 2014, 07:56 |
DFBI Superposed rotation inside overset mesh.
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#1 |
New Member
CFDguy
Join Date: May 2014
Posts: 20
Rep Power: 12 |
Hey guyz,
I want to find the trajectory of a propeller driven aircraft. So i am thinking of using overset meshing and by giving DFBI to the whole aircraft body and giving DFBI superposed rotation to the propeller. so is it possible? thanks in advance. |
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August 29, 2014, 05:34 |
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#2 |
Senior Member
Ping
Join Date: Mar 2009
Posts: 556
Rep Power: 20 |
yes this is possible
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August 29, 2014, 06:20 |
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#3 |
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CFDguy
Join Date: May 2014
Posts: 20
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so we can have sliding mesh inside overset mesh? i thought since overset mesh performs the hole cutting process, we cannot use sliding mesh inside an overset mesh.
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August 29, 2014, 07:08 |
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#4 |
Senior Member
Ping
Join Date: Mar 2009
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if you need me to say yes again then yes it can be done and was shown at the global conference this year
and if you are using a recent version eg 9 you can can overlapping overset meshed regions which means the propellor could be in an overset region inside the other overset region rather than within a sliding rotation region |
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August 29, 2014, 10:13 |
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#5 |
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CFDguy
Join Date: May 2014
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actually i am simulating an airship in which there are two propellers attached to its body through two suporting rods. now to provide thrust vectoring these two rods can be swiveled around and change the angle of thrust of the propeller. so to model this i was thinking of using overset mesh, but for the rotation motion of the rods and propellers, i need to use sliding mesh. also i am thinking of using dfbi motion to find out its trajectory.
i have posted a question on this with some fotos in this thread. http://www.cfd-online.com/Forums/sta...rset-mesh.html please take a look at this. thanks in advance for ur help. Last edited by rockydongre; August 30, 2014 at 15:41. |
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August 30, 2014, 15:45 |
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#6 |
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CFDguy
Join Date: May 2014
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So when i did all this i could not align the propeller and rod with the motion of the airship. so what should i do to align the region of the rod rotation and propeller rotation with the airship?
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September 2, 2014, 10:37 |
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#7 |
Senior Member
Ping
Join Date: Mar 2009
Posts: 556
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you use two motions being a normal dfbi rotation and translation and a dfbi superimposed rotation and apply this second one to the propeller region and add the propeller surface to the dfbi body parts
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September 2, 2014, 14:36 |
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#8 |
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CFDguy
Join Date: May 2014
Posts: 20
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as i mentioned earlier i am simulating a case in which the propeller is rotating as well as swiveling, i.e. providing thrust vectoring to the airship. in this using dfbi superimposed roation will not work. i tried using rotation for swiveling and then superposed rotation for rotation of propeller but inspite of keeping the coordinate system of the motion of the propeller aligned with the swiveling motion and also keeping the swiveling motion aligned with the airship, i could not able to align the propeller to the airship movement and everytime the propeller just moves away. what should i do?
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September 3, 2014, 09:03 |
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#9 |
Senior Member
Ping
Join Date: Mar 2009
Posts: 556
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i have not done this within dbfi and suggest you ask support about it
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dfbi, overset mesh |
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