Define Diffusion Source

Holagee · April 4, 2019, 17:26

Hello All,

I am trying to simulate the effect of electric field on methane-air flame. The electric field will induce movements of ions within the flame due to potential difference. Hence, I need to define a new diffusion source called (Ambipolar diffusion) which is computed as follows:

I want to add this diffusion term to the energy equation since the diffused ions carry heat due (as enthalpy), but I need to compute the divergence of the ambipolar diffusion source that I defined in the UDF code. Does anyone know how? or in general an easier way to include this diffusion effect?

I appreciate all the help!

AlexanderZ · April 4, 2019, 23:42

Ansys Fluent Customization manual

look for user defined scalars

best regards

Holagee · April 5, 2019, 02:33

Quote:

Originally Posted by AlexanderZ

Ansys Fluent Customization manual

look for user defined scalars

best regards

But how to link this UDS to the energy equation?

AlexanderZ · April 5, 2019, 03:06

you may add heat source to cover the effect of your UDS

best regards

April 4, 2019, 17:26	Define Diffusion Source	#1
Holagee New Member Ghadeer Join Date: Feb 2019 Posts: 5 Rep Power: 8	Hello All, I am trying to simulate the effect of electric field on methane-air flame. The electric field will induce movements of ions within the flame due to potential difference. Hence, I need to define a new diffusion source called (Ambipolar diffusion) which is computed as follows: I want to add this diffusion term to the energy equation since the diffused ions carry heat due (as enthalpy), but I need to compute the divergence of the ambipolar diffusion source that I defined in the UDF code. Does anyone know how? or in general an easier way to include this diffusion effect? I appreciate all the help! Last edited by Holagee; April 5, 2019 at 01:15.

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April 4, 2019, 23:42		#2
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 35	Ansys Fluent Customization manual look for user defined scalars best regards

April 5, 2019, 03:06		#4
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 35	you may add heat source to cover the effect of your UDS best regards