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Enthalpy calculation

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Old   September 3, 2020, 05:14
Default Enthalpy calculation
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William Haigh
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Hi everyone,
I have successfully found a solution for my Mach 5 scramjet inlet and displayed the results in ParaView. I have values for temperature, density and pressure. I would like to calculate the enthalpy.
Is there an easy way to do so in ParaView using the calculator?
If not, can SU2 calculate the enthalpy?
Thanks!
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Old   September 3, 2020, 09:46
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Amit
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You can use calculator in ParaView to do so.
Make use of pressure, density. Get velocity components by dividing momentum with density and use the enthalpy formula..
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Old   September 4, 2020, 04:39
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Thanks for the help! Would you mind detailing the steps? What formula for entropy are you using?
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Old   September 6, 2020, 08:08
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Hi William,

Your first post mentioned Enthalpy so I am assuming that as a variable to be computed.

In ParView, press Calculator and compute a variable with any name you like (let us say Vel_vec) and in formula - Momentum/Density

Again highlight this Calculator1 and compute Total specific enthalpy (Hs or whatever name you like) with (let's say 2D case) formula -
Pressure*3.5/Density+0.5*(Vel_vec_X*Vel_vec_X+Vel_vec_Y*Vel_vec _Y)
(here 3.5 is for gamma/(gamma-1)).

Best
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Old   March 31, 2021, 05:31
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William Haigh
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Hi, sorry for only replying now.
Your method worked well but could you explain how you derived this formula? I've been trying to find similar formula on the Internet but I cannot seem to find it.
I also tried to check the units but they didnt seem to add up. Should the total specific enthalpy be in J/kg?
Thanks
William
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Old   April 1, 2021, 07:04
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Hi WilliamH, You can find it in most of the text books (Gas Dynamics, CFD).

Basically H=h+V^2/2

here - h= CpT = g*RT/(g-1) = 3.5*P/Rho for g=1.4 & V^2=u^2+v^2+w^2 in 3D.

Yes it is total specific enthalpy and unit is J/kg or m^2 sec^-2.

Here my primary intention was to convey the procedure of calculating a variable of interest in ParaView from available dataset.

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Amit
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