02 November 2018
Dear Mr. Amine;
Thanks for your response.
I tried reducing the dem time step to 1e-5, the fluid time step to 1e-4 and increased the maximum number of DPM time steps to 50,000.
Unfortunately, the warning still exists and there is a non-realistic solids void fraction of 0.002 ?!
Can the problem in the parcel's mass flow?
I calculated it into Matlab m-file as follows:
total_mass_flow = 0.3*0.3*0.01*0.6*density; % mass of the solids occupied 0.3x0.3x0.01 2D domain with 0.6 initial void fraction
m_p = (pi/6)*diameter*diameter*diameter*density; % physical particle mass
n_p = total_mass_flow/m_p/x_count/y_count/z_count; % total number of physical particles/parcel
mass_flow = n_p*m_p/1e-8; % parcel mass flowrate in 1e-8 injection time period