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combustion with injection of particles: Gravity ON = calculation of DPM is very slow |
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#1 |
Member
Nikolaos Babilas
Join Date: Nov 2014
Posts: 37
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Hello everyone i have a combustion with injection of particles. i noticed that when i activate gravity the calculation of DPM is very slow and all the particles are incomplete. does anyone know if it is necessary to activate gravity for my problem?
thank you |
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#2 |
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Ethan Doan
Join Date: Oct 2012
Location: Canada
Posts: 90
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I think gravity will be important if the density difference between the two phases (rhop-rho) is large enough to make the second term non negligible to the first term.
dup/dt = Fd(u-up) + (g(rhop-rho)/rhop) +F |
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#3 |
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John Yu
Join Date: Dec 2014
Posts: 26
Rep Power: 12 ![]() |
You could try to change the Step length factor to speed up the calculation of DPM or Particle time step size for unsteady particle tracking.
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#4 |
Member
Nikolaos Babilas
Join Date: Nov 2014
Posts: 37
Rep Power: 12 ![]() |
do you believe that i should increase or reduce the step length factor?
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#5 |
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John Yu
Join Date: Dec 2014
Posts: 26
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