Learning Forum

[vikash0603]

Dear all,

I am using the eulerian multiphase and species, transport model. My concern is to specify the value of species volume mass fraction and multiphase volume fraction at the inlet ( water inlet at left), inlet 2 (glycerin inlet at right). Additionally, while patching, I want to keep the fraction of water and Glycerin both 0.1 in the porous zone to converse the solution. I am attaching the (.PNG) file. Kindly look into it, and help me specify the value. 

I used a volume fraction of 0.9 at both inlets and a mass fraction of water 1 at the left inlet, mass fraction of water 0 at the right. inlet. I ran the simulation and found a floating-point error.

Kindly also specify the value of volume fraction during patching

Glycerin inlet 2 multiphase.PNG

[Rob]

Staff aren't permitted to open or download attachments so please repost the pictures.
Are the water and glycerin different phases? Or different species in the same phase?

[vikash0603]

[vikash0603]

Dear Rob,
Glycerin and water are different phases (wetting phase), but in our case , only one one wetting phase is allowed, So I chose species transport combining water and glycerin as one phase. Later mass fraction of each can be assigned at inlets.

[DrAmine]

Water and glycerin are modeled as multicomponent flow: if yes then please disable Multiphase Model and stick to species transport.

[vikash0603]

Dear DrAmine,
Water and glycerin is modeled in the mixture templates of species transport. The multiphase model is the base of my model

[DrAmine]

Okay I understand: what is now the question or which problems are you facing?

[vikash0603]

I am using the eulerian multiphase and species, transport model. My concern is to specify the value of species volume mass fraction and multiphase volume fraction at the inlet ( water inlet at left), inlet 2 (glycerin inlet at right). Additionally, while patching, I want to keep the fraction of water and Glycerin both 0.1 in the porous zone to converse the solution. I am attaching the (.PNG) file. Kindly look into it, and help me specify the value.
I used a volume fraction of 0.9 at both inlets and a mass fraction of water 1 at the left inlet, mass fraction of water 0 at the right. inlet. I ran the simulation and found a floating-point error.
Kindly also specify the value of volume fraction during patching.

Kindly go through earlier post

[DrAmine]

That value should be a user input: what is the state at start? Same applies at the boundaries: do you have in reality 90% Volume Fraction? Is it correct to assume pure water at one inlet and no water at the other?

[DrAmine]

Do you require multiphase model at all? Do you have pure gas or pure liquids or both states in the system?