## Simulation CFD

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# Distributed resistance

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A quick question. In distributed resistance, while specifying the constant directional coefficients for resistances in which flow happens only in the through-flow direction (e.g. wiremesh, perforated sheet, wedge wire), the loss coefficient for that direction is finite and known. But since the flow doesn't happen in other two normal directions, ideally, the loss coefficient is infinitee.

How do the following approaches sound for determining the the other two normal directions?

1) Keep the loss coefficient equal to 1000 times the loss coefficeint for through-flow direction

2) Keep the loss coefficient equal to 0, which implies infinite resistance.

Is #2 a correct assumption in case of SimCFD?

Solved! Go to Solution.

# Re: Distributed resistance

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Hi Omkar,

In 2014 and for stability, I would just x1000 for the other 2 directions.

**Jon Wilde**

# Re: Distributed resistance

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Thanks Jon. That is how I generally specify. However, as a curiosity I wanted to know how specifying zero for normal loss coefficient would affect the results. Does it mean zero resistance (which would cause all the flow to divert to that direction) or does it mean infinite resistance (no flow in that direction)?

# Re: Distributed resistance

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As far as I know, it means 100% open

**Jon Wilde**