Error while importing transient pressure using external data module

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  • Last Post 13 December 2018
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Siva Teja Golla posted this 16 November 2018

Hi,     

     I am trying to import transient pressure data due to fluid flow to the Mechanical module using "External data" module. But while importing the pressure data into the Mechanical module, I am encountering the following error -   " The data in the worksheet is invalid. Please correct before proceeding to import ". I have done exactly as shown in the tutorial. The corresponding pictures are attached.  The datasheet is also attached for the reference. I want to import the transient pressures in the datasheet to the transient structural module and calculate the displacements and accelerations of the tank walls... But the above-mentioned error is obstructing me. Need some hit/help in resolving it....

Thanks in advance

 

 

 

 

 

 

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Aniket posted this 16 November 2018

Siva Teja Golla,


In addition to these images can you also paste the image of the tree? Do you see any question marks in the tree outline? If yes click on them and see any fields are highlighted in yellow?

Most probably, you'll find the imported load marked by a question mark which indicates it needs some inputs from the user.

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Siva Teja Golla posted this 17 November 2018

Thank you Aniket,

I am attaching the picture of the tree...

There is "Imported load" marked by a question mark and it is asking for the magnitude of the pressure. But we can give the pressure distribution at only one time-step as can be seen in the next picture...

So, how can I do the transient analysis if I can give pressure loading only at one time-step... ????

When I import the load at single time-step, the pressure distribution on the tank wall is being shown.... as in the below picture...

 

But, when I tried to solve with this loading and check the "Imported pressure" under the "Solution" tree, it is showing that the max. and min. pressures to be "0". Is it because of the warnings that are being shown at the bottom... (picture attached)

Please clarify my doubts in this regard...

Thanks in advance

Siva Teja Golla posted this 22 November 2018

Thank you Aniket,

I am attaching the picture of the tree...

There is "Imported load" marked by a question mark and it is asking for the magnitude of the pressure. But we can give the pressure distribution at only one time-step as can be seen in the next picture...

So, how can I do the transient analysis if I can give pressure loading only at one time-step... ????

When I import the load at single time-step, the pressure distribution on the tank wall is being shown.... as in the below picture...

 

But, when I tried to solve with this loading and check the "Imported pressure" under the "Solution" tree, it is showing that the max. and min. pressures to be "0". Is it because of the warnings that are being shown at the bottom... (picture attached)

Please clarify my doubts in this regard...

Thanks in advance

rgpatchi posted this 23 November 2018

Hello Siva Teja, 

Regarding your first question, "But we can give the pressure distribution at only one time-step as can be seen in the next picture..."

- Simply add the new data (new Pressure file) in a new row. You can change the analysis time accordingly (also scale or offset if needed) as shown in the image below. 

Regarding your second question, "But, when I tried to solve with this loading and check the "Imported pressure" under the "Solution" tree, it is showing that the max. and min. pressures to be "0". Is it because of the warnings that are being shown at the bottom... (picture attached)"

- Honestly speaking, I am not sure how you got this post-processing object, for Imported Pressure. Please clarify the steps you used to get this. 

In any case, if you want to plot the imported pressure, you can do it via User defined result, by plotting SMISC13 values on the SURF154 elements created due to the applied pressure load. 

Steps:

1. Set, General Miscellaneous --> Yes (under Analysis Settings --> Output Controls --> General Miscellaneous). This is to store the miscellaneous results, while, SMISC13 comes under this category.

2. After solution, click on Solution branch in the tree, then toggle on Worksheet. Here you can select "Material and Element Type Information", after which you can simply RMB on SURF154 in this table --> Insert User Defined Result. (If you have multiple SURF154 types, RMB --> plot items helps you understand which of them corresponds to a particular load you are interested in). Then in the User defined result, provide under Expression, SMISC13. This will evaluate the applied pressures.

Images:

Hope this helps. Let me know if you have any questions.

Best regards,

Rohith

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Siva Teja Golla posted this 13 December 2018

Hi Rohith,

         Thank you for your reply. I have tried what you said. Now I can see that all time steps being loaded. 

But I have some questions -

1. In the "Imported pressure data", we have to add the new data files in each row. But what if I had some 100 files..

2. As mentioned previously, I used "External data" module to import the transient fluid pressures on to the tank walls in "Transient structural" module. I am using "Transient structural" because my desired output is the accelerations of the tank walls.

3. I have imported the fluid pressure data for some 0.5 sec in the intervals of 0.025 sec to check how the simulation is running. After I made all the analysis settings and applied constraints and tried to run the simulation. Then I have encountered the following error - 

Though, this error did not stop the simulation to finish, but I noticed that the result ( acceleration) is erroneous due to it. 

I have checked for the folder which is mentioned in the error message. I could not find any as such. Because of this error, I am suspecting that the workbench is not able to use all the load files at different times. Instead, it might be taking only the very first load file and doing the calculation for the entire interested time range. May be due to this only, the magnitudes of the results are coming much smaller that anticipated...

 

Please clarify my doubts...

Thanks in advance

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