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Meeting Minutes 29/11/2011

3D


Adrian:

Adrian has been looking at the new mesh files

49 outlets now available on his model

Been looking at journal focusing on modelling the bifurcations from CT scanned imaged

Tom mentioned that he has found a paper describing grid independence

However it doesn’t use Star-CCM.


Dominic:

Adrian sent some STL files over the weekend, and Dominic is looking at how to merge the top part of the trachea with the Solidworks model.

Brenda Tinnerman has GeoMagic, she may be able to help with meshing Charlie’s geometry.

Dr Chung: Dominic can you have a look at whether there is a difference between upper airways of men and women.

Apparently no difference


Laura:

Has been working on writing the literature review

Hasn’t finished it yet

The articles she has been reading have been modelling a specific few bifurcations

Depositions seems to mainly be on the split of the bifurcation (carina)

In the first couple of bifurcations the depositions efficiency can be 40-50%

Dr Chung: can this software handle the full airway particle deposition simulation

For stick condition: implicit unsteady on with a time step of 0.1 seconds


1D


Charlie:

Since last meeting created an algorithm to recreate the geometry from the STL file centreline data

Realised that not only was this not essential, as this data can be extracted from the STL file

But it is actually very difficult to implement in one area of the algorithm

For this reason Charlie's effort was turned to the algorithm for generating new airways

Coding in Fortran started with Talha yesterday (monday)

Hopefully this will mean a working model is created by the presentation in week 10

The current limitations of the model are: Cuboids are used for the lung volume

The lobe boundaries are not yet included. This can be done by mapping the visual human project onto the mri scan.


Tom:

Tom’s pressure model has been done for a while

Has been working with Dhillon on the spreadsheet to incorporate angle change

Dr Chung: do you have the ‘nature: an optimal bronchiole tree may be dangerous’?

May be useful for the above problem

Dr Chung: Go through Dr Chung’s paper on the equations for programming the dynamics of the lung.

Charlie: is Tawhai’s lung physiome paper similar to Dr. Chung’s equations?

Tom: Seems to be useful for the simulink simulation of the lung

Tom: this will be compared to Dr. Chung's paper of lung flow rate equations


Daniel:

Was not able to attend because he had a job interview in London


1D modelling general notes from Dr. Chung:

We can define the straight pipe section

Can we calculate the friction?

Friction proportional to length

If diameter increases

Friction decreases

If flow rate increases

Friction increases

So we know that friction is a function of these variables

You can translate friction as a pressure difference between the inlet and outlet conditions

So you only have one unknown, which is your inlet flow rate, the rest of the generations only introduce constants.