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Problem of Transient draining of Tanks

CarlosRomero
14-Alexandrite

Problem of Transient draining of Tanks

Hello Mathcad community,

Can anyone tell me where the error is?

Regards,

CarlosRomero

ACCEPTED SOLUTION

Accepted Solutions

There is a unit mismatch in function H

Werner_E_0-1749253637108.png

 

Guess it should rather read

Werner_E_1-1749253657402.png

 

In the plot at the end you should not use the desired units in parentheses. 

If the plot should be shown in standard units (which are seconds and meter in your case anyway) its not necessary to do anything:

Werner_E_2-1749253983756.png

To show the units you may either use the labels or divide by the desired units:

Werner_E_3-1749254037389.png

That kind of division is necessary in case you don't want the plot shown in default units.

Here is the same plot using minutes at the x-axis and feet at the y-axis:

Werner_E_4-1749254101487.png

The difference lies of course just in the scaling of the axis.

 

MC15 file attached

 

View solution in original post

3 REPLIES 3

There is a unit mismatch in function H

Werner_E_0-1749253637108.png

 

Guess it should rather read

Werner_E_1-1749253657402.png

 

In the plot at the end you should not use the desired units in parentheses. 

If the plot should be shown in standard units (which are seconds and meter in your case anyway) its not necessary to do anything:

Werner_E_2-1749253983756.png

To show the units you may either use the labels or divide by the desired units:

Werner_E_3-1749254037389.png

That kind of division is necessary in case you don't want the plot shown in default units.

Here is the same plot using minutes at the x-axis and feet at the y-axis:

Werner_E_4-1749254101487.png

The difference lies of course just in the scaling of the axis.

 

MC15 file attached

 

CarlosRomero
14-Alexandrite
(To:Werner_E)

Thank you Werner.

There were two errors in the development. One regarding the units and the other was the roughness value.

Regards,

CarlosRomero

Both our fixes for the unit mismatched are equivalent.

Sure I did not catch the missing "0." in the definition of "e"

 

BTW, is "draining_time" supposed to be the position where h1=0? That's not the case.

Werner_E_0-1749294477734.png

 

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