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postProcess -field U -func mag, Why it gives error?

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Old   April 9, 2020, 12:39
Wink postProcess -field U -func mag, Why it gives error?
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Hi guys.

Ok, I already know that I can use the following code and compute the mag of U easily:

Code:
postProcess -func "mag(U)"
There is a big but here. Checkout this command:

Code:
postProcess -fields "(p U)" -func wallShearStress
It is mentioned in the OpenFOAM user guide and it works just fine. I guess you guess what my question is now; why I cannot get the mag of U by the following command:

Code:
postProcess -field U -func mag
It gives me the following error:

Code:
Time = 1

Reading fields:
    volVectorFields: U

Executing functionObjects
--> FOAM Warning :     functionObjects::mag mag cannot find required object <fieldName> of type volScalarField
--> FOAM Warning :     functionObjects::mag mag cannot find required object <fieldName> of type surfaceScalarField
--> FOAM Warning :     functionObjects::mag mag cannot find required object <fieldName> of type volVectorField
--> FOAM Warning :     functionObjects::mag mag cannot find required object <fieldName> of type surfaceVectorField
--> FOAM Warning :     functionObjects::mag mag cannot find required object <fieldName> of type volSphericalTensorField
--> FOAM Warning :     functionObjects::mag mag cannot find required object <fieldName> of type surfaceSphericalTensorField
--> FOAM Warning :     functionObjects::mag mag cannot find required object <fieldName> of type volSymmTensorField
--> FOAM Warning :     functionObjects::mag mag cannot find required object <fieldName> of type surfaceSymmTensorField
--> FOAM Warning :     functionObjects::mag mag cannot find required object <fieldName> of type volTensorField
--> FOAM Warning :     functionObjects::mag mag cannot find required object <fieldName> of type surfaceTensorField
--> FOAM Warning :     functionObjects::mag mag failed to execute.
What are the differences?

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Old   April 9, 2020, 14:08
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You need a configuration file in the system directory, like this:
https://github.com/OpenFOAM/OpenFOAM...ing/fields/mag
change the <fieldName> to U

and then:
Code:
postProcess -func mag -field U
finally, you will get mag(U) in the $time directory.
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Old   April 9, 2020, 14:16
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Quote:
Originally Posted by zhangyan View Post
You need a configuration file in the system directory, like this:
https://github.com/OpenFOAM/OpenFOAM...ing/fields/mag
change the <fieldName> to U

and then:
Code:
postProcess -func mag -field U
finally, you will get mag(U) in the $time directory.
Thank Yan,

But I already have the configuration file in the OpenFOAM caseDicts directory. However, I copied the file into my system folder too:

Code:
foamGet mag
I tried the command but again the same error happened.

Cheers
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Old   April 9, 2020, 14:18
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Don't forget to change the <fieldName> to U
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Old   April 9, 2020, 14:21
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Quote:
Originally Posted by zhangyan View Post
Don't forget to change the <fieldName> to U
Yea, that did the trick. Thanks!

However, I get two warnings whenever I try to compute mag(U) field using any method. Do you know why?

Code:
Time = 1

Reading fields:
    volVectorFields: U

Executing functionObjects
--> FOAM Warning :     functionObjects::mag mag cannot find required object U of type volScalarField
--> FOAM Warning :     functionObjects::mag mag cannot find required object U of type surfaceScalarField
    functionObjects::mag mag writing field: mag(U)
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Old   April 9, 2020, 14:22
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Me too. Just forget it.
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