April 22, 2018 at 8:22 pmshahryarSubscriber
i am student of mechanical engineering i am having final year project on Tesla turbine. As its is not conventional turbine it uses discs instead of blades so i want to do CFD of it. I have been trying to do it for 3 months but all i get is some lines as velocity contours but according to theory there should be band of velocity profiles decreasing towards center of disc. I am not sure whats the problem can anyone help me i am so stressed as my deadline is approaching .
April 22, 2018 at 10:08 pmpeteroznewmanSubscriber
Please reply with a post where you attach a workbench project archive .wbpz file, so that we may see your model. You may have to Clear the mesh data before saving the archive because the attach feature on this site is limited to 120 MB. Here is more info on archive files.
April 23, 2018 at 7:55 pmshahryarSubscriber
Thank you for replying.
I have attached the file it only contains upto geometry file. Tesla turbine that i am sending model of has 10 disc with each disc having gap of 1 mm in between consecutive discs. For simplicity i am using one disc and casing spacing between disc and casing i have selected equal to 0.5 mm on each side of disc.In reality when water will come through inlet it will pass through gaps between disc causing shear force due to boundary layer and disc gap we have chosen is just twice the boundary layer to accommodate for 2 boundary layers between 2 discs.
According to theory and previous cfd of researchers suggest that as the water come in it will cause shear force on disc and make it rotate and as fluid progress between disc it losses its energy and travel toward center of disc to exhaust holes where it exhaust axially. So accordingly when we do cfd we should be able to see circular bands of velocity decreasing towards center i am going to also share here the results of some well known research papers.
My boundary conditions are as below as this turbine is expected to produce 1 kw of energy.
I have uploaded the file we need to put following condition in ansys.
INLET = Mass flow inlet ( 0.2 kg / sec) As total mass flow rate for 10 disc is 1 kg /sec
Outlet = Pressure outlet
fluid domain around disc can be rotated at 1000 rpm or if you like you can rotate disc walls as well
We need to capture boundary layer and first cell height i have calculated is 0.00034 mm
- Here is the link to how tesla turbine works
April 23, 2018 at 7:57 pmshahryarSubscriber
here is work bench file i have only done till name seselection
April 24, 2018 at 12:52 amraul.raghavSubscriber
Would you be able to upload your entire workbench file with the setup and results in it? If it's too big to attach here directly, you can upload it to google drive and share the link here.
February 3, 2019 at 10:59 amDev _cfdnoobSubscriber
February 4, 2019 at 10:44 amRobAnsys Employee
Are you both working on the same model?
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