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Running the same mathcad file with different input value (mathcad15)

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Running the same mathcad file with different input value (mathcad15)

Hi all,

I am new here and a bit of a mathcad newbie. I taught myself how to use it by trial and error and googling which is probably not the best way to go about things.

I have written a mathcad file which calculates the flowrate of gas through an orrifice by simply inputting 1 value which is the depth.

This works fine as i can pick any depth i want and get the desired flowrate, however i would like the calculation to the give me the flowrate over a range of depths i.e 10,20,30,40....350 meters.

I can use a single colum matrix with multiple rows however my calculation starts to trip up when it encounters the if statement for each of these values.

The calculation works flawlessly if i input 1 depth, however for multiple depths it has this problem. Any help would be greatly appreciated

Simon

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1 ACCEPTED SOLUTION

Accepted Solutions

Re: Running the same mathcad file with different input value (mathcad15)

Thanks Andy for spotting that.

I had ignored al calculation above 1)..

Have changed parameter name from d to dp so it is not confused with the orifice diameter (ther was not problem with that, though) and attached some plots which may help to decide the correctness of he results.

View solution in original post

9 REPLIES 9

Re: Running the same mathcad file with different input value (mathcad15)

We can't debug a picture, so pelase post the file.

It seems you should turn your calculations inti s function dependend on depth which you then call with a vector as parameter (and probably you should vectorize the function call).

For a quick hack it may help to vectorize the calculation of Q.

Re: Running the same mathcad file with different input value (mathcad15)

sorry, file posted now. I left it as a working file with 1 depth input

thanks

Simon

Re: Running the same mathcad file with different input value (mathcad15)

Would the attched file help?

BTW - Mathcad can work with units and you may even define your own. Why don't you use that feature? Much less cumbersome than adding the units manually in textboxes.

Re: Running the same mathcad file with different input value (mathcad15)

Wow such an easy fix !

so sick ! thank you very much for your help and i appreciate the other comments such as changing to boolen to prevent red text. Your right it was for information only

thanks again

Re: Running the same mathcad file with different input value (mathcad15)

You are welcome.

Its often a good idea to turn calculations into functions, being more versatile.

Re: Running the same mathcad file with different input value (mathcad15)

actually this doesnt quite work as when i checked the value of flow at depths using original calculation it does not match what is given by the vector

Highlighted

Re: Running the same mathcad file with different input value (mathcad15)

the pressure functions are also dependant on depth, (all of) these should be changed to the X(d) format.

Re: Running the same mathcad file with different input value (mathcad15)

Thanks Andy for spotting that.

I had ignored al calculation above 1)..

Have changed parameter name from d to dp so it is not confused with the orifice diameter (ther was not problem with that, though) and attached some plots which may help to decide the correctness of he results.

View solution in original post

Re: Running the same mathcad file with different input value (mathcad15)

Thank you very much ! lots of help