How to calculate the Total pressure?

Altair Forum User

Acufieldview gives the nodal pressure output, but if I want to see total pressure how its possible.

 

I tried through the function tab by creating the formula Ptotal = Pressure+ 0.5*rho*V^2

but it doesnot accepts the formula.

ydigit

If you are looking for integral values (over a surface) then the easiest way is to get the Total Pressure  in AcuProbe.

 

If you have not created any formula a simple Kelvin to Celsius would be a good start.

Try copying this string in the formula field.

'pressure'+(0.5*'density'*('velocity_magnitude'^2))

Altair Forum User

I have tried copying the above message but it give an error like it is an unknown quantity.

I have attached the error message.

<?xml version="1.0" encoding="UTF-8"?>

ydigit

Do you see density  as a scalar in AcuFieldView?

If no, then replace density in the above formula with a numerical value.

Altair Forum User

I was using the same thing from the beginning when the formula did not worked i.e the density value instead of the string 'density', But then also the value makes a large difference in Acufield and AcuProbe.(I have attached two files of same model for total pressure results of Acufield and AcuProbe), in which AcuProbe results matchup with my analytical results. Also, when we calculate for velocity magnitude it gives the different value for velocity in AcuProbe and Acufield. Furthermore if I calculate the velocity in both x axis and y axis, how it can be calculated? Because it doesnot gives the option in AcuProbe.

<?xml version="1.0" encoding="UTF-8"?>

<?xml version="1.0" encoding="UTF-8"?>

ydigit

Could you post a few pictures of the contour plot with mesh ? Probably the mesh is too coarse for the integration in AcuFieldView. With a fine enough mesh results from both AcuProbe and AcuFieldView should match.