Hi, all: I have an assembly of particles which needs to consolidate first, then I need to apply a surcharge on top of them. I thought of two ways: (1) apply a box on top of the assembly. But my question is how to add a box (dynamic = true) after a certain steps, for example, first iterate 5k steps then activate the top box? (2) Apply a force on top of the load, adding another "Engine", count the iteration number "Niter", after "Niter", add the load on top of the particle assembly. Hope I have made my problem clear. I think the 1st way is better, is there any sample code that I can look into? Or just provide some ideas. Thank you very much! Best Regards, Feng, Chen Graduate Student Department of Civil and Environmental Engineering 223 Perkins Hall University of Tennessee, Knoxville, 37996 http://fchen3.googlepages.com/home <https://tmail.utk.edu/exchweb/bin/redir.asp?URL=http://fchen3.googlepages.com/home>
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