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I want to obtain the vorticity with expreField, but error occured

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Old   September 16, 2023, 03:12
Default I want to obtain the vorticity with expreField, but error occured
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Code:
	vorticity
	{
		type exprField;
        libs    (fieldFunctionObjects);
		autowrite true;
		dimensions [0 1 -2 0 0 0 0];
		field vorticity;
        expression "curl(U)";
		verbose true;
		autowrite true;
		writetControl timeStep; 
	}
--> FOAM FATAL IO ERROR: (openfoam-2306)
Object curl does not exist or wrong type in expression
<<<<
curl(U)
>>>>
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