Hi Ahmad,
It surely depends on the system you want to simulate. Each MD package is developed for a particular purpose.
What exactly are you looking for in an MD package and what molecule/system do you want to perform simulations?
As above, MD is too broad of a term - you need to at least specify the system you're interested in.
For simulating proteins/biomacromolecules the most commonly used ones are Amber, CHARMM, gromacs (free) and NAMD (free); all come with very good tutorials. Their popularity comes from the use of some of the most-developed protein/biomacromolecules forcefields (amber, charmm, gromos); however many other MD engines can use these forcefields as well, so there's a huge number of MD programs to choose from.
I'm not an expert on other uses of MD (though I use charmm for organic molecules) - please, take a look first at available force fields at https://en.wikipedia.org/wiki/Force_field_(chemistry) and then decide, which one are you interested in.
You can consider AMBER and GROMACS package. Of course, it depends on your research question that you wanna study. I read one of your questions about creating radicals in some kinda package. If you would like to study those radicals interaction with a model system you could use Gromacs because several ROS force filed is already available for these molecules.
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