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For Density the accumulated variable is divided by the volume of the mesh element where it is defined.
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For Count the accumulated variable is unaffected by the element size.
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For Elements the value of the accumulated variable in an element is the sum of the source terms of all particles in that element. If the Accumulator type is set to Density, this sum is divided by the mesh element volume. At a later time, a particle has no effect on the value of the accumulated variable in an element it passed through previously.
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For Elements and time the time derivative of the accumulated variable in an element is the sum of the source terms of all particles in that element. If the Accumulator type is set to Density, this sum is divided by the mesh element volume. As each particle moves through a series of mesh elements, it leaves behind a contribution to the accumulated variable that remains even after the particle has moved on.
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