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September 3, 2020, 05:14 |
Enthalpy calculation
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#1 |
New Member
William Haigh
Join Date: Aug 2020
Posts: 20
Rep Power: 6 |
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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September 3, 2020, 09:46 |
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#2 |
Member
Amit
Join Date: May 2013
Posts: 85
Rep Power: 13 |
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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September 4, 2020, 04:39 |
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#3 |
New Member
William Haigh
Join Date: Aug 2020
Posts: 20
Rep Power: 6 |
Thanks for the help! Would you mind detailing the steps? What formula for entropy are you using?
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September 6, 2020, 08:08 |
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#4 |
Member
Amit
Join Date: May 2013
Posts: 85
Rep Power: 13 |
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 Amit |
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March 31, 2021, 05:31 |
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#5 |
New Member
William Haigh
Join Date: Aug 2020
Posts: 20
Rep Power: 6 |
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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April 1, 2021, 07:04 |
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#6 |
Member
Amit
Join Date: May 2013
Posts: 85
Rep Power: 13 |
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. Best Amit |
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Tags |
enthalpy, paraview, supersonic inlet |
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