Particle tracing with micropillars

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Hi, i am trying to trace particles in a micro channel with micropillars. The micropillars are placed together with a small gap between them for the fluid to get through, but the gap should be small enough to stop the traced particles from getting through. Ive changed the particle size to be larger than the gaps but they seem to still get through. The micropillars are set as walls and the particles still seem to react to them by going around them instead of through them, however the gap should be too small for them to get through. Could anyone help please?

Thanks


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