I have been looking into this a little further, but I seem to be getting more confused.
I made a simple y-pipe and introduced particles in SW2011, SP0.0, as shown here: (cutaway view)
The particle fate is "Max Steps in Cell," but I couldn't find a Help entry that exaplains what this means. The particle path is visible when I zoom in:
The particle bounces off the pipe wall, then is pushed back into the wall and slides along it. Default Wall Condition is set to Reflection, e_n = 0.1, e_t = 0.1
With the mesh shown, it's clear that the particle takes many steps in each cell:
The particle is moving from the upper right corner to the lower left, and it's sliding along the pipe wall when it comes to a stop. I would expect the end condition to be "Absorbed" not "Max Steps in Cell" since the particle is on the wall, and it takes multiple steps in each preceeding cell. Also, according to the color, the particle was accelerating from about 90 m/s to 91 m/s when it suddenly reached the end of its path.
Does anyone know what Max Steps in Cell means? Does it mean the particle bounced off a wall too many times in a cell? If so, how many times is too many?
I haven't used particle studies much, but I know that if you don't have enough length or iterations in the settings it will simply stop paying attention to particles.
In the Settings tab have you tried changing the maximum number of iterations or length or time and seeing it changes where it stops paying attention to the particle in question?
particle iteration count.jpg 707.2 KB
Thanks for the idea but I already ruled that out. The particle residence time was already way less than the minimum time step. I tried increasing both the time step and the max iterations 10x and 100x just to see what would happen, but the resulting particle fate data didn't change at all.
Any other ideas?
ps - I think I accidentally hit "Correct Answer" but I didn't mean to.
I have noticed that the amount of computer RAM sometimes plays an important part in particle trajectories. We had to increase our system RAM to 8GB to have good results. Not sure if this might help...
I'm using solidworks to do convection heat transfer in the microcomputer. The problem is my understanding on the number of iterations.
2 simulations are done through 2 different setting on the iteration:
1) goals convergence (result obtained as in Pic 1 attached - stop at iteration 56)
2) maximum iterations = 42 (result obtained as in Pic 2 attached - stop at iteration 42)
How do I explain about the differences of data ( in this case temperature) at iteration 20 and iteration 30??
For goals convergence; what is mean by goal convergence?? is it equilibrium state/ condition??
This number of iterations are not explained about time, am I right?