How to simulate a passive scaler transport?

Angkon · July 4, 2023, 12:58

Hi, I want to acquire concentration profile(concentration gradient) iodine injected into blood within left coronary artery, here iodine is the passive scaler and I only need to consider advection diffusion through blood i.e. non-reactive process.
Here boundary conditions that are applied for blood flow are:
1) No slip boundary condition at artery wall,
2) Pulsatile velocity and pressure profile at inlet and outlet respectively, using udf.

I am confused how to define the passive scaler or which module should I use : CFX or Fluent, what should I use multiphase or multispecies or user defined scaler or 'the species option in fluent'. how do I define the source of the scaler what mole fraction should I use?

Thank you in advance.

LuckyTran · July 4, 2023, 15:53

You can use either CFX or Fluent but in Fluent it is called a user defined scalar. You can use a species transport equation if you want since passive scalars are indeed scalars.

The mole fraction is your concentration. If there is a source, then specify the source. If not, then there is not.

July 4, 2023, 12:58	How to simulate a passive scaler transport?	#1
Angkon New Member Angkon Biswas Join Date: Jul 2023 Posts: 13 Rep Power: 3	Hi, I want to acquire concentration profile(concentration gradient) iodine injected into blood within left coronary artery, here iodine is the passive scaler and I only need to consider advection diffusion through blood i.e. non-reactive process. Here boundary conditions that are applied for blood flow are: 1) No slip boundary condition at artery wall, 2) Pulsatile velocity and pressure profile at inlet and outlet respectively, using udf. I am confused how to define the passive scaler or which module should I use : CFX or Fluent, what should I use multiphase or multispecies or user defined scaler or 'the species option in fluent'. how do I define the source of the scaler what mole fraction should I use? Thank you in advance.

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July 4, 2023, 15:53		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,752 Rep Power: 66	You can use either CFX or Fluent but in Fluent it is called a user defined scalar. You can use a species transport equation if you want since passive scalars are indeed scalars. The mole fraction is your concentration. If there is a source, then specify the source. If not, then there is not.