Older presentation about the spectral element method

This is an older presentation that was delivered at SPIE Smart Structures/NDE 2010 conference about the spectral element method. In order to see the animation you have to download the pdf file. It is rather detailed about the specifics of the multi-physics coupling.

SPIE 2010 Spectral Element Presentation

ANSYS Tutorial For Lamb Waves Modeling

Technorati Tags: ANSYS,Finite Element Method,Lamb Waves

I have made a tutorial for the same course for simulating Lamb waves propagation as an exercise for the general considerations that I have posted earlier. I hope it makes things clearer. You can download it from:

https://dl.dropboxusercontent.com/u/50597292/Ansys_Tut.pdf

The same steps could be applied to any other FEM software. 

Consideration when modeling guided waves

Technorati Tags: Science,Spectral Element,Wave Propagation,Guided Waves

There are several consideration to be taken into account when modeling guided waves, in fact any wave propagation phenomena will require a similar consideration. Those considerations and a fairly simple background are summarized in the following presentation.

07 Modelisation_ondes

A presentation about the Spectral Element Method

This is a modified version of a presentation I have given in CANSMART 2011 workshop>

Spectral Element Fast Solver for Piezoelectric Structures

And here is the paper

2011-RamyPaper_PM

Technorati Tags: Spectral Element,Wave Propagation,Numerical Simualtion,Lamb Waves,Guided Waves

Is Object Oriented Programming the best Programming Paradigm for Number Crunching Applications? (1-4)

Undoubtedly there is an almost worldwide belief as well as acceptance of the huge benefits of the Object Oriented Programming Paradigm. For example in my field -Finite Element Methods (FEM)- there is a plethora of publications about the object oriented frameworks and planning for an OO FEM software.

The main focus of this series, will be to test the claims as well as real needs for full OO features in a number crunching application. So, I well first explain what I understand as OO paradigm in the context of computational science, with a specific focus on the FEM. Then I would like to examine the motivations usually introduced for the need for OO in FEM. Finally, another extremely important feature is the effect of adapting such an approach on the computational performance.  

First, OOP main objectives are to minimize the maintenance and modification costs of a code. Another aspect is the data hiding (encapsulation) which is really a very important aspect for delivering software components to other users or coworkers. So, as much as we are concerned this mainly benefits a collaboration project between different programmers. Another result is the ability to have unified interfaces between different objects and methods. So, if you want to change or add new behaviour to an object you would need only to add a single part that is responsible for that method, and as long as the interface remain intact no one of the users of the code need to worry about the implementation issues of the procedure.

But that is not all, a very important facet of using OO paradigm, is the reusability of the code. Typically there is already established algorithms and implementations already checked for correctness. Yes, I am aware of the fact that this is not unique to the OO Paradigm. But when combined with the data encapsulations and polymorphism it becomes a very powerful way of thinking about the overall design of the application with less concern about how the different pieces fit together, and how they perform.