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FDS13-Aquamarine
13-Aquamarine
Sep 18, 2014 11:46 AM UTC
Solved

How to solve this pipe flow problem

I try to solve a pipeflow problem but I have problems in doing so as I have no experience in this type of problem. In the first part of the sheet you will find the known variables. In the second part I try to calculate the different pressures. However, I have problems in setting up the equations. Would anyone be so kind to help me with this? The file is made with MC15

Werner_E
Werner_EAnswer
25-Diamond I
Sep 18, 2014 12:37 PM UTC

1) V1, V2 need to be defined

2) All equations except the top 4 should be normal assignment above the solve block.h.exit:=..., etc.

3) You should solve for P1, P2, P3 AND P4 as well (4 equations, 4 variables to solve for)

4) You need guess values for P1 .. P4, not for other variables.

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16 replies

Werner_E
Werner_E25-Diamond IAnswer
25-Diamond I
Sep 18, 2014 12:37 PM UTC

1) V1, V2 need to be defined

2) All equations except the top 4 should be normal assignment above the solve block.h.exit:=..., etc.

3) You should solve for P1, P2, P3 AND P4 as well (4 equations, 4 variables to solve for)

4) You need guess values for P1 .. P4, not for other variables.

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FDS13-AquamarineAuthor
13-Aquamarine
Sep 18, 2014 8:05 PM UTC

Thank you Werner that solved the issue

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FDS13-AquamarineAuthor
13-Aquamarine
Sep 21, 2014 9:33 AM UTC

I have one additional question. How could I calculate "theoretical" V when forcing P1 to be 0 mmHg and by changing Pc? For clarity I have put both in purple. Sorry, for these obvious questions.

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