Sometimes I get frustrated by fortran!

I like FORTRAN. Really I do. I like creating programs that work and give me answers that mean things and that I can use to help me write reports and things for uni.

I have problems with it though. It took me ages to understand what I'm trying to do with my latest program. Creating a fortran program based on misunderstandings is never a good idea. I now have the concept though. I understand roughly what I'm trying to do.

The only thing is that now I know what I'm doing I can't figure out how to tell the computer the right fortran so that it will give me the desired answers.

My summer project

My project title is:
"Species (MMP) transport in an abdominal aortic aneurysm with a porous ILT."

A quick vocab guide might be of use to those who do not have a clue what that means...
MMPs are Matrix-metalloproteinases. I'm not entirely sure what they are, but I have a feeling they're tricky buggers.
An aneurysm is when your artery swells up like a balloon due to a problem in the artery wall (usually thinning caused either by age or by an accident). The aorta is the main artery going from your heart up and round and then down towards your legs. Aneurysms may rupture and when they do the chances of survival are not good. Abdominal aortic aneurysms are known as AAAs or Triple-As.
ILT is an Intraluminal Thrombus. A thrombus is a blood clot. Intraluminal means it's within a structure (so within the artery).
Hemodynamics is the study of the flow of blood.

Overall agreed objectives:

Write a medical review of AAAs including MMP influence.

Write a scientific review of AAAs including hemodynamics, experimental and computer models.

Develop a simple steady flow model of a AAA with a porous thrombus and mass transport.

Develop a simple pulsatile flow model of a AAA with a porous thrombus and mass transport.

Mesh a realistic model taken from segmented CT images.

Incorporate the simplified anatomical model developed above into the realistic anatomical model.

Analysis of interactions between the thrombus, blood, and the artery wall with respect to AAA progression.

Deliverable(s):
1. A simple CFD model of AAA mass transport in steady flow with a porous ILT.
2. A simple CFD model of AAA mass transport in pulsatile flow with a porous ILT.
3. A realistic model of AAA mass trans port in pulsatile flow with a porous ILT.
4. A project report

I'll be using ANSYS FLUENT to model the aneurysm in 2D and 3D. The 3D version will come from a CT scan from a real-live poorly person. I hope that they got patched up okay and are still alive.

I expect to be very busy this summer. The project is due to start at the beginning of June. Before then I am going to have to do some medical reading. I'm really excited about this project. It sounds really cool (and hard work) and interesting.

Some cool links and news

I got pointed to this YouTube video at the weekend, it is *really* cool and is the sort of thing that makes me sqwee about my subject. You should watch it because it has pretty lights and bouncing shampoo!

Another cool YouTube video is this one about ferro fluids. Ferro fluids are magnetic and... well watch the video and see for yourself what they do.

Today I read the news that my old uni is yet again doing something really cool now that I'm not there to see it. I missed their big show of venus passing in front of the sun about 3 years ago and now I'm missing the first ever 3D images of the sun. Traumatised I am!

That's all for the links for now, I'm incredibly busy with my MSc these days and don't get much time for thinking about any other maths stuff other than coursework and I don't really want to write about that any more than necessary. I do however have something to write about my upcoming summer project which should be a lot of fun, but also very hard work. Before I do that, however, I need rest and I need to do a little more research on it.

Progress in CFX

Last term we did an introductory course for ANSYS CFX and I found it really interesting. ANSYS CFX is a computer package with which you can design an object, then create a mesh to cover it (imagine a spider's web stretched over the object) and then you can set parameters and things and tell it to model what would happen if water came in one end, air through the top and there was just one outlet pipe (for example). Then as if by magic the program thinks about it for a while and gives you an answer.

Well now we have to do some coursework using it, it's not due until May and today I started it finally. I've been trying to start it for the past 4 weeks now, but all my attempts have been thwarted by the problem of a locked door. There is just one room in the whole university that has CFX computers in apparently and as CFD Masters students we are allowed to go in there. Only the door is always locked. It took two weeks to ascertain who was going to be allowed to give us permission to go in there. Then that person was off sick, then he was in meetings for most of last week. Well today I caught up with his secretary again and found out that the room is meant to be unlocked in office hours and that we can go in whenever we want, so long as there isn't a class in progress. Hurrah!

So I spent an hour or so playing with a piece of software I learnt a little bit about 3 months ago and haven't been able to touch since. On my third attempt I managed to complete the basic design for the object we were told to create. I meshed it first time without any problems. Then I tried to open it in what they call the Pre-Processor. I failed. It's got the wrong file extension and I have no idea how to convert it to the correct one. I can't recall that we were ever told how to go from meshing to pre. This is frustrating. I'm hoping that someone else in my class knows and can show me later in the week. This should not be a problem considering we're now allowed in the room Mon-Fri, 9am-5pm.