Optimization - Recent Threads

Creating a blade cutback in Autoblade

JosephSmith — Wed, 26 Jun 2024 12:56:36 GMT

Good day,

I am currently parametrizing an impeller blade geometry in Autoblade. I would like to shift the hub leading edge coordinate, denoted by B, along the base of the blade to point C as per image 1.

This operation would be an attempt to replicate the cutback angle performed in CAD, shown by image 2,3 and 4.

I attempted to replicate the cutback angle effect in Autoblade by shifting the hub leading edge coordinate in the meridional view. However this results in moving coordinate B radially closer to the axis of rotation like the image below:

instead of smoothly along the blade. This is shown by the upstream leading edge shift in the meridional views of images 5/6.

Ideally, point B should follow the curvature of blade however this was not the case. I believe I am missing an aspect in this regard to fully replicate the CAD cutback operation in Autoblade. In this regard, I would like to know if such an operation is possible

Thanks

FINE Design 3D .FD3 Error

JosephSmith — Wed, 10 Aug 2022 10:13:12 GMT

Hi Everyone,

It is me again. I had been running a FINE design 3D optimization and had received a .FD3 Error. It is seen in the following images:

These issues had occurred after a windows update, I believe.

Prior to this update, the database generation had run successfully, and the optimization was running. However, when I looked at my PC after a while, I believe an update and reboot had occurred, leaving the first optimization incomplete.

I created and tried to run a new optimization. However, I was met with the following images:

Entering my credentials did not work so I had rebooted the PC. After that, it allowed me to run the optimization. However, that is when the .FD3 error occurred. Running the database also resulted in this .FD3 error

The job files displayed this error:

I would appreciate any help on how to resolve this error.

Kind regards

How to manually set max iterations on Design3D

JosephSmith — Sun, 10 Jul 2022 11:30:21 GMT

Hi Everyone,

My question is how to manually set the max iteration to run each simulation in the database for Design3D. context: I am attempting to start a multipoint optimization of a centrifugal impeller with water as the fluid. I am using the Spalart-Allmaras turbulence model with the following boundary conditions in the turbo solver:

The Barotropic Cavitation model within Fine turbo is enabled. I only changed the saturation pressure based on the operating temperature, and Amin value to 80 based on a rough calculation of the speed of sound in the two phase medium.

The initial simulation converged to global residuals of -3.8 with the above selections. However, all the samples failed to converge in design3d. It was not a mesh failure, only convergence errors. Opening up the job_eranus files for each computation showed that sometimes the simulation would stop at just 200 iterations. Other times it would stop at 3000. I've summarised them below

I suspect the convergence would improve if I manually set the max iterations to 5000, like my initial simulation. I would like to know how to do this in fine design 3d as I only saw the option to set the convergence level. Alternatively, I would appreciate any other angles to resolve the error.

Design3D Screening error: No mesh quality report file found or readable

JosephSmith — Tue, 28 Jun 2022 17:58:36 GMT

Hi everyone,

I have been trying to set up an optimization project in Design3D. It is for a centrifugal impeller with a blunt trailing edge (its a constant dmr blunt type). I had run an initial simulation in fine turbo and made a parametric model of the geometry in Autoblade. I used the geomturbo file from the Autogrid mesh as the target model for the Autoblade modelling.

My problem lies when I try running the Screening operation in Design3D. I get the following error seen in image 1 which appears after STEP 4 Mesh quality failed in the Task manager tab

Opening view computations info shows the following information:

The quality report file was missing from the above directory. It was only in the directory where I saved the Autogrid mesh files. So, I then pasted the MKS.quality report file in the above directory ( \_trk\_flow\_mesh). The same error still appeared even after adding the quality file to the directory. I suspect maybe its the ''not being readable'' error now.

I am not quite sure how to resolve this error and would appreciate any help. This error did not occur when I did the desgin3d tutorial 1

Autoblade: Number of slices in ''Build blade sections from CAD surfaces'' affecting surface generation

JosephSmith — Sun, 19 Jun 2022 22:10:54 GMT

Hi all,

I had meshed a centrifugal impeller in Autogrid, and intended to use that geomturbo file as the target model for parametrization in Autoblade.

The target model did not have sectional data and I had to use the ''Build blade sections from CAD surfaces'' to make sliced sections. First, I chose two sections at 0.01 and 0.99. I used the compressor template as the initial parametric template and arrived at a reasonably accurate version of the blade, seen in the 3 images:

Albeit the curvature at the leading edge was not as accurate seen at the B2B view of section 1:

I tabulated my selected parameters below:

My problem is when I chose more than two sections for the initial slicing of the target model in the ''Build blade sections from CAD surfaces'' option: When I tried with 3 sections at 0.01 0.5 0.99, I got a drastically curved leading edge and unusual trailing edge:

The blade to blade view for the middle section shows that the leading edge stacking point is drastically far off from target geometry:

I am uncertain as to why this is the case. I have been tinkering with the Stacking Laws options but have not had luck identifying how this issue occurred or ways to resolve it. I would be grateful for a second opinion on this situation