[pradeepjp]

Is it required to use parcel simulation in closed cycle (compression and combustion stroke) diesel engine simulation..

kindly help me thru the simulation steps..

[SamWijey]

Hello,

Yes, it is necessary if you want to inject Diesel in to the combustion chamber. Please check our diesel sector example case in v2.4 Studio to learn how to do this. This is a closed cycle simulation.

Thanks,

[pradeepjp]

Thank you for your response. But consider it a port fuel diesel injection and am trying to simulate only compression and combustion stroke with a closed geometry (attached file). How to define case setup for this problem?

[SamWijey]

Hello,

If you want to assume that the fuel is completely premixed at IVC, then you do not have to use a spray simulation. You simply specify the gas composition (which should be a mixture of oxidizer, fuel and any diluent) at IVC. There is a Dual Fuel engine sector example case in Studio where we assume that NG is premixed at IVC while Diesel is directly injected. Look at the NG premixed part and ignore the diesel injection.

Hope this helps,

Thanks,

[pradeepjp]

Thank you very much sir. I proceeded accordingly but since i have only one region (cylinder, head and piston) with no events involved, I couldnt validate the events tab. how to proceed further?

[tmburton]

Hello,

You don't need events enabled if you only have one region.

Best regards,

Tristan

[pradeep6890]

Thank you sir. I validated all as per your suggestion. but while checking the compression ratio it is showing 1.1 where the target is 17.5? i have attached file for your reference.

[nitesh.attal]

Originally Posted by pradeep6890

Thank you sir. I validated all as per your suggestion. but while checking the compression ratio it is showing 1.1 where the target is 17.5? i have attached file for your reference.

Please check if you have imported the geometry in correct units (m), e.g. measure the length of your liner in the imported geometry.
You can use the transform->scale-> entire domain feature in STUDIO to apply appropriate scaling factor.

Thanks,

[pradeep6890]

Thank you sir. I proceeded accordingly but the pressure values are quite abnormal compared to the experimental values. I have herewith enclosed the pics for your reference. Where am I being wrong? kindly provide your valuable suggestions.

[mohsinmkhan]

Originally Posted by pradeep6890

Thank you sir. I validated all as per your suggestion. but while checking the compression ratio it is showing 1.1 where the target is 17.5? i have attached file for your reference.

you have to follow tutorial videos for achieving target compression ratio. make sure you got right current compression ratio

[mohsinmkhan]

Originally Posted by SamWijey

Hello,

If you want to assume that the fuel is completely premixed at IVC, then you do not have to use a spray simulation. You simply specify the gas composition (which should be a mixture of oxidizer, fuel and any diluent) at IVC. There is a Dual Fuel engine sector example case in Studio where we assume that NG is premixed at IVC while Diesel is directly injected. Look at the NG premixed part and ignore the diesel injection.

Hope this helps,

Thanks,

But is this the right way of assuming it as premixed... because it would not provide results within 10% error margin....?