# Calculating Pressure Drop

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 January 30, 2008, 13:34 Calculating Pressure Drop #1 M Guest   Posts: n/a Sponsored Links Hello, I've got a curved pipe section with cyclic boundaries set at either end. The boundaries have a prescribed massflow rate, and I would like to be able to output the average Pressure Drop across the pipe. I thought you could output the area averaged Pressure across the inlet and outlet faces? How would I do this? Thank you

 January 30, 2008, 15:21 Re: Calculating Pressure Drop #2 Jim Guest   Posts: n/a STAR-CCM+ or STAR-CD?

 January 30, 2008, 17:26 Re: Calculating Pressure Drop #3 M Guest   Posts: n/a Sorry, Star-CD.

 January 31, 2008, 06:56 Re: Calculating Pressure Drop #4 Kasper Guest   Posts: n/a You will find this macro useful (It looks better if I email it to you) !************************************************* * ! FLS Airtech ! Case study of pressure drop across filter section ! Pressure drop calculations ! KSK, FLS Airtech, Aug. 2005. !************************************************* load\$ !----finds the total massflux through the inlet------------ !----Defines the inlet boundary cset news grange -0.1 2.25 cset subs type 4 spoi 0 1.5 3 snor 0 0 -1 surf off view -1 -0.95 -0.44 \$zoom,off cplo !----the density is loaded into post register 4 getc all dens !----integrates over the defined inlet plane inte cset !---gets the total massflux (tavs multiplies the A*v_n*scalar in postregister 4) *get mtot tavs !----Finds the total pressure------------------------------ !Section: Inlet. cset news type 4 spoi 0 1.5 3 snor 0 0 -1 surf off view -1 -0.95 -0.44 \$zoom,off cplo getc,all,dens !----stores the total pressure in register 5 oper,getc,ptot,5 !---- multiply the density and total pressure oper,mult,4,5,4 inte cset *get avtp tavs *set TP0 avtp / mtot !Section: Outlet. cset news grange 17.6, spoi 20 1.405 -2.5 1 snor 0 0 -1 surf off view -1 -0.95 -0.44 cplo getc,all,dens oper,getc,ptot,5 oper,mult,4,5,4 inte cset *get avtp tavs *set TP1 avtp / mtot !Pressure difference over the inlet-outlet sections *set dp-filter TP1 - TP0 *list

 January 31, 2008, 15:08 Re: Calculating Pressure Drop #5 Andrea Guest   Posts: n/a Drop a .pstt file from the sim at each time step you want to know the pressure... Then cset,news,type,n where n is the type of the cell at your inlet (or outlet) and then store the pressure data in your model After that do summa,cset and in the text windows you'll se the mean pressure stored in the register 4

 January 31, 2008, 15:31 Re: Calculating Pressure Drop #6 Pauli Guest   Posts: n/a Boundary region monitoring. At the command line type - help brmo. In the NavCenter go to Analysis Controls -> Output Controls -> Monitor Engineering Behavior -> Monitor Boundary Behavior.

 January 31, 2008, 18:06 Re: Calculating Pressure Drop #7 M Guest   Posts: n/a Pauli, That was what I tried to do before I posted this message but I can't seem to find where the data is output to? I've tried both the standard and additional .info files.

 February 1, 2008, 08:41 Re: Calculating Pressure Drop #8 Polly Eda Guest   Posts: n/a Try the .erd file.

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