Adrian

Havent had much time to do the grid independence with a pressure boundary condition

However have found the pressure difference

Dr chung: what are your parameters?

Grid parameters: base size of 1mm, adjusting the prism layers, there are 5 prism layers, thickness of 2

Dr Chung: can both you and dominic summarise the parameters that you use as they have to match

Dr. chung: how did you remove the smaller airways

Adrian: I didn’t edit the airways

Not focusing on the generations below the 3^rd generations

Those have a really course mesh

Once Adrian has done the grid independence for the larger airways, he will apply that the second generation and then further on.

Dr chung: so what is the Reynolds number?

1200

Dr. Chung: and this is steady mode?

Steady, constant density, laminar

Dr chung: As you go down the flow profile will get more complex, but the Reynolds reduces.

Dr chung: 1 million sounds to few

Talha: but he is doing localised grid refinement, so this is maybe enough

Dominic

The upper airways are going well

Dominic showed Dr. Chung the profile

Dr Chung: are you using similar parameters?

Yes, they all met up and started using similar parameters

Laura

Changed her parameters slightly

Using a pressure difference over the upper airways

Seen quite a nice jet flow with pressure parameter of 3Pa

Dr Chung: maybe you could look at the conditions used in the jet flow papers, to see if they are comparable

Laura will email the screen shots

Dr Chung: if we can recreate a similar result to the jet flow paper that would be good

Dr Chung: how is your particle analysis going?

Laura is finishing off the jet flow and then going back to particle analysis

Using a 1mm base size, 5 prism layers, thickness 2, stretching of 200

Adrian: you can take plane sections of this

Dr Chung: how many elements

Laura: 150,000

Dr Chung: 150,000 shouldn’t take that long

Anything else from 3D?

Adrian: You said we would be receiving the full geometry, from the mouth piece

Dr Chung: This should hopefully come soon. Will save us some hassle in terms of merging the stl files

Tom

Got the 1D model defined

Hopefully dhillon is looking for the elasticity in papers

Angle changes are in the excel file

The matlab file isnt quite finished, but its almost there

Dhillon said he would type up the equations used in the excel file so that we can reference them in the report

Tom came up with a bit of code that allows him to highlight a bifurcation, and works out a weighted average by selecting a group of points

It then gives you an average point

The data format for the angle changes is another important area

Instead of defining all of the points in one big table we define an end point and a beginning point with an angle

Dr. Chung: You need to be able to go in either way along the branches

Can do this using a pointer

Tom will look into this

Charlie

Dr Chung has seen the branching structures that have been produced so far.

The surface plotting has a bug in it but the centreline model is fine

I can run my model from zero, and then run it from 6 to see the difference between 3D and 1D modelling.

I haven’t been able to find a good way to use the stl lung volume file as a boundary condition

Dr Chung suggested using ellipsoid boundary conditions

Ideally I would like to approximate the lung volume with a ‘lego brick’ voxel definition. However I am not sure how to do this with stl as it only defines a boundary, not which side of the boundary has the volume.

Dr chung suggested manually describing which side of the geometry is the lung

I will look into this

Once tom decides the data format for storing the angle change I will have to reflect this is the program

I have been using the fortran compiler on the f211 computers

I am also going to start writing up the theory used in my section

Dhillon

Had a telephone interview

End Note

Can we all email talha times that we are available to present