Learning Forum

[Shin]

Hello

I want to calculate the flame propagation from right to left in a simple geometry as shown in the figure.

However, when I cut a one-dimensional-like mesh in a two-dimensional region as shown in the figure, the calculation does not converge.

I think it is probably a problem of the aspect ratio of the mesh, but I would like to know what I should pay attention to in cutting such a mesh and what I should pay attention to in the calculation conditions.

I do not want to cut a fine mesh in the vertical direction if possible, since the information I need is only one-dimensional information in the left and right directions of the figure.

The calculation area is 1 mm in height and 15 mm in width.

Sorry for the rudimentary question.

[Essence]

Hello,

Flame propagation in Fluent cannot be modeled in one dimension.

[Shin]

thank you for reply.

I'm sorry late reply.

I understand one-dimentional calcuration is cannot in fluent.
So if I want to do this calculation, I need to use a 2D region and cut a fine vertical mesh?

[Rob]

In theory you could make a mesh with a lower y size and have an aspect ratio of 1. Set upper & lower edges as symmetry and you have the domain you want. The problem will be getting the fuel & oxident to mix with a layer of combustion products potentially separating the two. So, in practice it may not work well. 

[Shin]

Hello, Rob
Thank you for reply
I try lower y size model. It's image is below.

The calculation area is 10 µm in height and 15 mm in width.

Since you suggested the problem of separation of the mixture, I cut a coarse mesh(2.5µm) in the y direction.
Could you give me your opinion?

[Rob]

What happens when you try and run the model?