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June 16, 2010, 08:39 |
Body to rotate by action of the air flow
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#1 |
New Member
Roberto Pravata
Join Date: Jun 2010
Posts: 3
Rep Power: 15 |
Hi all, I need your help
How can I do for a body to rotate by action of the air flow? I want to know the speed of rotation as a function of air velocity. Do I have to do with "moving reference frame model? or "rigid body motion model? Many thanks. |
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June 16, 2010, 11:29 |
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#2 |
Senior Member
Join Date: Apr 2009
Posts: 154
Rep Power: 17 |
What you need to use to accomplish your goal is the "6-DOF Motion Model." You can then setup reports to monitor rotation rate.
Since this is a complicated model, I suggest you read all the help documentation and practice on very simple geometry first. |
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June 27, 2010, 14:31 |
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#3 |
New Member
Roberto Pravata
Join Date: Jun 2010
Posts: 3
Rep Power: 15 |
THANKS!!!
but one more question how do I put up resistance to rotation. thank you very much |
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June 28, 2010, 11:38 |
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#4 |
Senior Member
Join Date: Apr 2009
Posts: 154
Rep Power: 17 |
HELP > Modeling > Modeling Dynamic Fluid Body Interaction > Working with 6-DOF Bodies > What are External Forces and Moments? > Adding an External Force or Moment
Read the help file, there's a damping moment, and a damping force you can add. |
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June 29, 2010, 10:19 |
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#5 |
New Member
Roberto Pravata
Join Date: Jun 2010
Posts: 3
Rep Power: 15 |
Yes, thank very much.
You are the Best. From Spain realy thanks. |
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August 9, 2010, 16:31 |
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#6 |
New Member
Rafael Oliveira
Join Date: Mar 2010
Posts: 6
Rep Power: 16 |
Hi rpravata,
Do you had success in simulation? Here, I have a channel (2D) with a square in the middle and I'd like to simulate the rotate this object by action of the fluid flow. I've been using a 6DOF udf together with dynamic mesh, but when I run the solver after some iterations appear the following error: Warning: negative volume detected --> repeat smoothing! I've tried decrease the time step, but the error persists. Following below the udf that I've been using: include "udf.h" DEFINE_SDOF_PROPERTIES(quadrado, prop, dt, time, dtime) { prop[SDOF_ZERO_TRANS_X] = TRUE; prop[SDOF_ZERO_TRANS_Y] = TRUE; prop[SDOF_ZERO_TRANS_Z] = TRUE; prop[SDOF_ZERO_ROT_X] = TRUE; prop[SDOF_ZERO_ROT_Y] = TRUE; /* Define the mass matrix */ prop[SDOF_MASS] = 1; prop[SDOF_IXX] = 0.25; prop[SDOF_IYY] = 0.25; prop[SDOF_IZZ] = 0.50; printf ("\n2d_test_box: Updated 6DOF properties"); } |
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