Define Diffusion Source

Holagee · April 4, 2019, 16:26

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, 22:42

Ansys Fluent Customization manual

look for user defined scalars

best regards

Holagee · April 5, 2019, 01:33

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, 02:06

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

best regards

April 4, 2019, 16:26	Define Diffusion Source	#1
Holagee New Member Ghadeer Join Date: Feb 2019 Posts: 5 Rep Power: 7	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 00:15.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
what is swap4foam ??	AB08	OpenFOAM	28	February 2, 2016 01:22
OpenFOAM without MPI	kokizzu	OpenFOAM Installation	4	May 26, 2014 09:17
[swak4Foam] Error bulding swak4Foam	sfigato	OpenFOAM Community Contributions	18	August 22, 2013 12:41
[swak4Foam] build problem swak4Foam OF 2.2.0	mcathela	OpenFOAM Community Contributions	14	April 23, 2013 13:59
DecomposePar links against liblamso0 with OpenMPI	jens_klostermann	OpenFOAM Bugs	11	June 28, 2007 17:51

April 4, 2019, 22:42		#2
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	Ansys Fluent Customization manual look for user defined scalars best regards

April 5, 2019, 02:06		#4
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	you may add heat source to cover the effect of your UDS best regards