MASSFLOW INLET vs PRESSURE INLET vs VELOCITY INLET | Ansys Fluent for Beginners
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This video demonstrates the differences between the "Massflow inlet" boundary condition and "Pressure inlet" boundary condition which can also be specified by "Named Selections" in Ansys Workbench.
This video explains the differences in applying the boundary condition with an example, clearly showing the difference in output results in terms of pressure and mass flow rate.
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Your videos are extremely useful. Please keep uploading more. And Thank you very much. Cheers !!!
thx friends ;) from turkey
How do I derive the volume of fluids at outlet in two phase flow when volume fraction at inlet are set at 1 for both fluids?
Thank you for the video. At the beginning of the video, you mentioned the choice of BC depends on target of the simulation. How about matching BC with the real world condition? For instance, a piston moves back and forth at one end of a duct. The other end of the duct is not completely closed (partially open).
Partially opened duct can be geometrically made. But in order to simulate the piston moving back and forth, we have to use moving mesh.
Can I know how to give tail water in ansys
I am curious how to set the mass flow entry conditions. When I set the mass flow inlet conditions, I get an error: Incorrect specific heating value. Thank you very much if you can reply to me.
I want to do combustion / gasification in ansys fluent, but everytime I do, I get confused always. Please respond me, I have some queries... When I mentioned my species composition and temperature in boundary condition, it gives me same in post processing... Means as it looks no reactions happen rather give me Same which I input... If I don't give thermal temperature and composition values, it gives me default... Means no reaction happens.... The same which I input in boundary conditions results the same.?
Hello Mech tech.
Could you do a tutorial of a three phased separator? With Oil, water and gas?
I've learned a lot with your videos, but I can't simulate that and I'm trying really hard.
Thanks!
Ill find a time for sure..
@@MechTechSimulations what is the formula to calculate the mass flow rate in channel flow over cylinder in 2 dimension? Please reply
Thank you for the video.
Can I ask, how can I set zero gradient pressure and velocity as boundary conditions in the inlet?
Thank you
Welcome Saheel Shirsat
Thanks for the video.
I have two inlet and I need to assign 1 in inlet1 and 0 in inlet2, how to do it?
Do you want to assign flow rate/velocity of 1 unit in inlet 1 and another as zero inlet [ie: mass flow rate or velocity at the inlet is zero]?
If so, its not a big deal, just mention the values in the boundary conditions. If you express something else, please let me know.
Thanks for your Video. I have a problem that I know the inlet pressure and mass flow rate and want to calculate the outlet pressure..Can you tell me how?
It's impossible. It's not practical too. If you provide a mass flow rate, the pressure required to maintain that flow rate depends on your geometry. You cannot provide it.
May i know what is your objective? Do you want to calculate pressure drop in a flow domain?
@@MechTechSimulations I have the same problem on a inlet duct silencer. The mass flow inlet is known and the total pressure/static pressure at the inlet face is zero (i.e. at atmosphere). How can I setup up the BC at the inlet face so that I can calculate the static pressure after the silencer?
What if we need to calculate outlet total pressure using same mass flow rate on both sides? Which combo would be taken
Dear waseeq siddiqui, the main thing you must know is that the mass flow rate at the inlet will be the same at the outlet at any cause (See: Law of conservation of mass).
In my experience, you could have "Massflow Inlet" and "Pressure outlet" if you know the flow rate and outlet pressure.
We can compute the inlet and outlet pressure to estimate the.
If you don't know the outlet pressure, go with "Mass flow inlet" and "Outlflow" boundary conditions.
Thanks for your help.
thanks
Thanks for your appreciation.
Sir I wanted to know what is the difference between using pressure outlet and outflow
If you don't know the pressure at the outlet, you can prefer outflow.
if im using air compressor as working fluid at the inlet , should i use pressure inlet or massflow rate inlet
If you are using an air compressor at the inlet, which maintains a constant pressure regardless of the flow domain or back pressure, pressure inlet should be the correct boundary.
@@MechTechSimulations thank you very much sir
For velocity inlet if we multiply area of inlet and velocity will gives discharge?
Yes
Hello, will you make a tutorial of how to use the mass flow rate BC?
Nevermind, the whole issue was in the direction of the vector. What's more interesting is finding a balance between accuracy and time of calculation
Can I put boundary volume flow Rate in the inlet fluent ?
No. But you can simply multiply the volume flow rate with its density and get the mass flow rate.
Otherwise, divide the volume flow rate with the inlet area and put the velocity. [velocity inlet]
Thank you 👍
I have 300kPa and 10m/s at inlet and want Pressure at exit. What should i do?
We cannot assign both pressure and velocity at the inlet. Because, it's dependent on the flow domain's pressure drop.
For your case, if you are constrained with the pressure and velocity at the inlet, you have to specify the velocity (Velocity Inlet). Based on the fluid properties and the backpressure offered by the flow domain, fluent will estimate the pressure at the inlet (an arbitrary pressure at the exit need to be specified). After computing a case, the exit pressure needs to be adjusted, to achieve the required pressure at the inlet.
Hope it makes sense. If not convinced with my answer, please feel free to drop your reply.
@@MechTechSimulations Thanks dear it makes sense. I am try to do the reverse engineering for it as u suggested.
@@MechTechSimulations i want to leave an email to u describing my issue
what is the formula to calculate the mass flow rate in channel flow over cylinder in 2 dimension? Please reply
do I need to consider the cross sectional area in case of a 2D contour?
If that is a cylinder, we need to select axisymmetric instead of planar in Fluent's general settings. In 2D simulations, the mass flow rate is computed and reported in Fluent by considering the third axis as 1m by default. You can change this in the reference values if you have the third axis dimension.