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searching for other particles in Lagrangian frame

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Old   April 22, 2013, 09:44
Default searching for other particles in Lagrangian frame
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Jam Rash
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Dear all,
I need a search algorithm inside my code to find the interacting force between two arbitrary particles. Better to say, I want to find the force of particle i on particle j (they should not necessarily be in contact). I know that I must use forAll ... for any individual particle. However, I have some problems in writing the code. Does anybody have experience in this field. Please help!

Best wishes,

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