UDS advective flux term divergence free

gyf135 · September 15, 2016, 19:19

Hi folks,

I am currently modeling the electro-hydrodynamics equation using UDS. Considering that the UDF guide says "advective flux field that is supplied by your UDF should be divergence-free", I am wondering if the "advective flux field" here means the vector field of psi (which has a unit of velocity) or the product of psi and phi(uds).

Since the electric field here is certainly not conserved due to the space charge effect but the current density is a conserved value for a steady-state solution, I am not sure if it is ok to type in the psi as "mobility * electric field and phi(uds) representing the charge density".

Thank you for your help!

tungli · July 16, 2019, 08:46

Hi!
I have the same questions. Have you figured out if it is OK to use nondivergence-free fields or what to do with electric field in presence of space charge?

September 15, 2016, 19:19	UDS advective flux term divergence free	#1
gyf135 New Member Yifei Join Date: Sep 2015 Posts: 5 Rep Power: 10	Hi folks, I am currently modeling the electro-hydrodynamics equation using UDS. Considering that the UDF guide says "advective flux field that is supplied by your UDF should be divergence-free", I am wondering if the "advective flux field" here means the vector field of psi (which has a unit of velocity) or the product of psi and phi(uds). Since the electric field here is certainly not conserved due to the space charge effect but the current density is a conserved value for a steady-state solution, I am not sure if it is ok to type in the psi as "mobility * electric field and phi(uds) representing the charge density". Thank you for your help!

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July 16, 2019, 08:46		#2
tungli New Member Jan Tungli Join Date: May 2019 Posts: 1 Rep Power: 0	Hi! I have the same questions. Have you figured out if it is OK to use nondivergence-free fields or what to do with electric field in presence of space charge?