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[ESPResSo-users] Question about the setting of agrid in L-B fluidics

From: Joe Ada
Subject: [ESPResSo-users] Question about the setting of agrid in L-B fluidics
Date: Mon, 11 May 2015 11:22:50 -0400


I try to run a model with ions and polyelectrolyte in solution in external electric field. The polymer is a 20um long chain with 1600 beads and springs, and the total number of the coions and counterions are 3*1600. What I care about is the hydrodynamic interaction between different beads, beads-ions and ions from the LB part. 

What is the practical setting of this grid number? 

My understanding of the agrid is that it determines the spacial resolution of the fluid. In the user guide, it says "It should also be noted that the LB nodes are located at 0.5, 1.5, 2.5, etc (in terms of agrid).". May I assume the resolution is 0.5 agrid? Does that mean that I have to make this 0.5 *agrid smaller than the typical distance ion travels during time tau*MD time step? 


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