DPM issues
 

Hi,
I am running an Eulerian and dense phase model with UDF for particle injection from file. I am trying to simulate biomass fluidization process. Also, am using ANSYS 15. My solution method is green-gauss node based and quick for both momentum and volume fraction spatial discretization.
from the surface monitor, I was tracking area weighted average of static pressure on the inlet (y-axis) and flow time (x-axis)

My questions
I noticed that my graph was negative before stabilizing at zero (sometimes) but I expect the graph to be positive at all time. are mine doing something wrong?

One of the factor that affect biomass is moisture, how do I capture cohesive force in my model....

I do not know how to include terms for shape factor since am injecting from file.


Thanks