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April 9, 2015, 07:11 |
Medical robot simulation
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#1 |
New Member
Ahmed Abdel Samad
Join Date: Apr 2015
Posts: 4
Rep Power: 11 |
Hello Everyone, I'm currently doing my bachelor's degree in Mechatronics and we are having a really tough time in our project.
I am simulating a micro-robot in a fluid flow to be able to understand it's propulsion characteristics throughout the drag forces that occur on this micro-swimmer. Basically my problem is that I never used ANSYS, and the simulation results are always wrong and not repeatable for different rotational values. let me explain what I have to simulate so you have a good understanding: a helical micro-robot, a robot which rotates around itself because of outer magnetic field thus from rotating at different RPMs different axial velocities are achieved it's basically like a screw rotation, but in fluid. the shape is very simple a helix attached to a very small cylinder magnet nothing more. I have the geometry from solid-works, mesh it on ANSYS and setup the problem but I have no idea if it's correct setup or not: I use the following: 1. K-epsilon model with default values 2. velocity inlet (either 1 or 2 m/s values, gauge pressure 0) 3. pressure outlet with 0 gauge pressure 4. Fluid is glycerin whatever it doesn't really matter 5. I use pressure based solver and the robot itself is read as a wall, additionally rotates around the (1,0,0) axes with 10 rad/s (at this point I need to simulate different values for rotational speed for a graph plot of the behavior) I also use a screen monitor for the Drag coefficient. I specify 1000 iterations but at after 280 it says Solution is converged! Any idea where did I go wrong? I'm pretty sure in almost everything but I have zero knowledge with ANSYS and I have to have results and valid ones specially I have to publish a paper, also if anyone has recommendation or able to help with problem setup I would be really glad. |
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cfd consulting, fluid dynamics, fluid flow, rigid body motion |
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