Dear nektar users, I am exploring my 3D dns data computed by nek5000, and hoping it would be used for stability analysis. I found nektar++ could read nek5000 binary field directly in the technical document http://doc.nektar.info/latest/class_nektar_1_1_field_utils_1_1_input_nek5000... I run FieldConvert -l, and it gives Available classes: Input: bse: Reads stability base-flow file. Input: chk: Reads checkpoint file. Input: dat: Reads Tecplot dat file for FE block triangular format. Input: fld: Reads Fld file. Input: fld5000: Reads Nek5000 field file. ................. .................. I firstly generate a cubic.xml file and then build a new nek5000 dns setup with exactly same coordinates. Then run it in nek5000 to obtain a sequence cubic0.f00001,.... cubic0.f00025 fields. Next, I defined the binary nek5000 data ( e.g. cubic0.f00025) as the restart file. When I run nektar, it gave an error, as below IncNavierStokesSolver cubic.xml ======================================================================= EquationType: UnsteadyNavierStokes Session Name: cubic2 Spatial Dim.: 3 Max SEM Exp. Order: 6 Expansion Dim.: 3 Projection Type: Continuous Galerkin Advection: explicit Diffusion: implicit Time Step: 0.01 No. of Steps: 5 Checkpoints (steps): 1 Integration Type: IMEXOrder2 Splitting Scheme: Velocity correction (strong press. form) ======================================================================= Fatal : Level 0 assertion violation Unable to load file: cubic0.f00025 Reason: Error document empty. Position: Line 0, Column 0 Did I miss something? or can someone help me? thanks! regards, Wei Cheers， Wei