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-   -   static pressure from mass flow rate (http://www.cfd-online.com/Forums/fluent/34898-static-pressure-mass-flow-rate.html)

 SAM October 22, 2004 05:37

static pressure from mass flow rate

it is stated in fluent user guide that for target mass flow rate it finds the mean static pressure and then finds mass flow rate and then subtract from target mass flow rate and finds again static pressure

i want to know by whcih equation it finds that static pressure , coz we dont know the mach number , total pressure at outlet etc

regards

 Leon October 22, 2004 07:44

Re: static pressure from mass flow rate

Quote from method 2: Second Step: use the required mass flow rate (the target mass flow rate), the current computed mass flow rate, and mean static pressure in ---Bernoulli's equation ---- to obtain a new mean static pressure value, applying under-relaxation to keep the solution stable.

And it is almost the same for method 1 since mass-flow rate is known for the previous iteration

 SAM October 22, 2004 07:52

Re: static pressure from mass flow rate

but bernouli equaton, where does it contain mass flow rate term

confused

plz help

 Leon October 22, 2004 08:49

Re: static pressure from mass flow rate

G {mass-flow rate }= B {constant, properties}* P_tot * function (P_tot, P_stat) * Area / sqrt ( R_gas * T_tot)

 SAM October 22, 2004 09:23

Re: static pressure from mass flow rate

thanks i will try it and let u know

regards

 SAM October 22, 2004 09:37

Re: static pressure from mass flow rate

wat is B and how we calculate p total

can u explain this formula or give book name

i would be thanful to u

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