Mesh file size is dependent on the number and complexity of unique meshes in the sim. To reduce its size, use instanced meshes across multiple particles, instead of unique meshes. So for example, a single mesh instanced across a billion particles will result in a tiny mesh file size, whereas a thousand particles each with a unique and complex mesh (perhaps as the result of a fracture operation) will result in a much larger mesh file size.
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Particles in container penetrating through wall
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