A warm greeting to all reputed members of physicsforum.com. I'm an undergraduate student. I'm trying to create a mathematical model for calculation of force of interaction between two identical bar magnets and force of interaction between a magnet and a steel disc. If I go with standard formulae then it would give me a blurred picture of the situation with certain limitation. So I decided to go for a software which would perform simulation so that a clear picture of force exerted can be formed with less time consumption. But after searching this forum for a perfect software for this I'm little bit confused. Please help me to find out a good software that can perform the simulation even when there are relative motions between magnet-magnet-steel plate.