[ramsri95]

Hi All,

I'm trying to use PimpleFOAM to solve a channel flow. I wanted to obtain the pressure gradient used the maintain a constant mass flux. The pressure gradient in meanVelocityForce is a scalar, hence has dimensions of [0 0 0 0 0 0 0]. But I want to either convert it to a dimensionedScalar of [0 1 -2 0 0 0 0] or equate it to another dimensioned Scalar I've created with the above mentioned set.

I keep getting the error that
Different dimensions for =
dimensions : [0 1 -2 0 0 0 0] = [0 0 0 0 0 0 0]

Can someone please help!

Thanks!
Ram

[shereez234]

Originally Posted by ramsri95

Hi All,

I'm trying to use PimpleFOAM to solve a channel flow. I wanted to obtain the pressure gradient used the maintain a constant mass flux. The pressure gradient in meanVelocityForce is a scalar, hence has dimensions of [0 0 0 0 0 0 0]. But I want to either convert it to a dimensionedScalar of [0 1 -2 0 0 0 0] or equate it to another dimensioned Scalar I've created with the above mentioned set.

I keep getting the error that
Different dimensions for =
dimensions : [0 1 -2 0 0 0 0] = [0 0 0 0 0 0 0]

Can someone please help!

Thanks!
Ram

You can multiply it with a dimensionedScalar "one" of [ 0 1 -2 0 0 0 0]. But when there is different dimensions usually it means somewhere you have made a mistake in the derivation or something.

[ 0 1 -2 0 0 0 0 ] means the units is m/s2.

[ramsri95]

Originally Posted by shereez234

You can multiply it with a dimensionedScalar "one" of [ 0 1 -2 0 0 0 0]. But when there is different dimensions usually it means somewhere you have made a mistake in the derivation or something.

[ 0 1 -2 0 0 0 0 ] means the units is m/s2.

Hey,

Thanks a lot! Apparently it turns out that the order of multiplication matters as mentioned in the file Scalar.H

Thanks a A lot!