speed simulation in visual nastran

[fcara]

Hello everyone, I'm trying to model a 600mm diameter auger that has to carry a certain product. Do you have any advice on how to set the simulation parameters from its menu to have faster model resolution times? the problem is that the more elements I insert to carry, the more weighting the simulation. Thank you very much for your advice.

 

[gerod]

simulation of what? fem, dynamic kineto analysis?
just to understand... .
I imagine dynamic camera.
Of course if you put in bodies to simulate the operation you need to know that the more you put more energy you need and so it is quite obvious that you slow down!

 

[listastudio]

First of all, are you sure it's all right with your installation?
do this verification: try to open the file that I attach here:http://www.simwise4d.it/ball_fan_vect.wm3It is a simple example of a fan that receives in gravity fall 48 small spheres as in figure:

image.jpg

If you let the saved simulation slide, you should see the spheres that collide with the fan spinning and are shot in various directions, projecting instant speed vectors. you should see the side cursor indicating the recorded story of the speed required to the fan. everything must turn fluid on a computer with a 1ghz repentum, 512mb ram and opengl accelerated graphics card, without snaps.

 

[listastudio]

if you now reset the simulation at first and then click on "world", "erase motion hystory", then delete the saved history and you can test the calculation speed as well as that of simple display of saved data.
launches the former novo simulation (the blue bar will no longer be in time history because no calculations saved) and waits for the balls to fall by gravity.
before they hit the fan, with the mouse move the cursor that regulates the speed of the fan from -100 to +100rpm, and then both clockwise and anti-clockwise.
the simulation must continue to spin fluid while letting you intervene to vary the speed of the fan.
have fun to vary from rotation to hourly rotation as the balls hit the blades, you should have almost instant response to video even from very modest computers (intel 1ghz, 512mb ram, xpsp3) as well as with an accelerated opengl video card hardware.
use as a performance comparison the 40 minute video of examples found in www.simwise4d.it and where there is also this example, made to turn on a 1ghz repentum with 512mb ram.

 

[listastudio]

I just received a stimulating phone call about this example, and then I take advantage of adding some notes before going to lunch.

the velocity variation of the fan performed in the above example makes physical sense only to test the platform's response to cinematic calculations and graphic display.

In fact, claim to control in real time the change of speed of the fan by interactively operating jumps of discrete speed values during the simulation (moving the mouse from -12 rpm to 38 rpm, for example) means requiring infinite torque to the motor applied to the fan; Only a very high pair can get the application of the new speed required at the next step of integration, that is in a very modest time.

in other words, a torque measuring window applied to the motor that turns the fan in this simulation allows to read the reaction to the "culps" of the spheres on the blades only when the fan turns at constant speed, or during very modest variations of speed for discreet jumps.

otherwise, pair peaks resulting from the required jumps of speed mask such result: one of the strategies recommended in http://www.lista.it/atnet/support.htm (es: in http://www.lista.it/atnet/faq3/debugging/2015.htm )

better then would apply an interactive torque control, instead of a speed control, thus being able to measure in the simulation the resulting speed of the fan and the forces discharged on the bearing of the same.

but in this case, the adjustment to the required speed would delay in consideration of the inertial transitory and still by reaction to the impacts of the balls, and this delay would affect the verification of the " simulation speed" that was precisely intended to test with the example.

Of course still that by turning this exemipo with the new simwise 8.5 to 64 bit under windows 8.... is all another experience!